diff --git a/src/Core/Platform/DisplayMode.hpp b/src/Core/Platform/DisplayMode.hpp
new file mode 100644
index 0000000000..75e6f94cc9
--- /dev/null
+++ b/src/Core/Platform/DisplayMode.hpp
@@ -0,0 +1,20 @@
+#ifndef CORE_PLATFORM_DISPLAYMODE
+#define CORE_PLATFORM_DISPLAYMODE
+
+namespace Core::Platform {
+
+    /**
+     * Each DisplayMode struct represents the settings which the users monitors is capable of displaying.
+     * Exists as a compatibility layer between `Core/` and `RageUtil/`. Without this, includes to `RageUtil`
+     * would be necessary in `Core`.
+     */
+    struct DisplayMode {
+        DisplayMode() = default;
+        int width{0};
+        int height{0};
+        int refreshRate{0};
+    };
+
+}
+
+#endif //CORE_PLATFORM_DISPLAYMODE
\ No newline at end of file
diff --git a/src/Core/Platform/Window/GLFWWindowBackend.cpp b/src/Core/Platform/Window/GLFWWindowBackend.cpp
index 14cf8a58bb..10621e0a55 100644
--- a/src/Core/Platform/Window/GLFWWindowBackend.cpp
+++ b/src/Core/Platform/Window/GLFWWindowBackend.cpp
@@ -198,6 +198,31 @@ namespace Core::Platform::Window {
         return videoMode->refreshRate;
     }
 
+    std::vector<DisplayMode> GLFWWindowBackend::getDisplayModes() const {
+        std::vector<DisplayMode> res;
+        int modeCount = 0;
+        auto *modes = glfwGetVideoModes(glfwGetPrimaryMonitor(), &modeCount);
+        for(int i = 0; i < modeCount; i++){
+            GLFWvidmode mode = modes[i];
+            res.push_back(DisplayMode{mode.width, mode.height, mode.refreshRate});
+        }
+        return res;
+    }
+
+    DisplayMode GLFWWindowBackend::getCurrentDisplayMode() const {
+        auto mode = glfwGetVideoMode(glfwGetPrimaryMonitor());
+        return DisplayMode{mode->width, mode->height, mode->refreshRate};
+    }
+
+    bool GLFWWindowBackend::setVideoMode(const VideoMode& p) {
+        this->videoMode = p;
+        int px, py;
+        glfwGetWindowPos(this->windowHandle, &px, &py);
+        glfwSetWindowMonitor(this->windowHandle, p.isFullscreen ? glfwGetPrimaryMonitor() : nullptr, px, py, p.width, p.height, p.refreshRate);
+        glfwSetInputMode(this->windowHandle, GLFW_CURSOR, p.isFullscreen ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_NORMAL);
+        return true;
+    }
+
     DeviceButton GLFWWindowBackend::convertKeyToLegacy(int keycode, int mods){
         // GLFW keycodes are all uppercase ascii. If we're in that ascii, determine if uppercase
         // or lowercase, and convert if necessary.
diff --git a/src/Core/Platform/Window/GLFWWindowBackend.hpp b/src/Core/Platform/Window/GLFWWindowBackend.hpp
index f663f70699..c0d3b195a3 100644
--- a/src/Core/Platform/Window/GLFWWindowBackend.hpp
+++ b/src/Core/Platform/Window/GLFWWindowBackend.hpp
@@ -26,6 +26,9 @@ class GLFWWindowBackend : public IWindowBackend {
     void setTitle(const std::string &title) override;
     Dimensions getFrameBufferSize() const override;
     int getRefreshRate() const override;
+    std::vector<DisplayMode> getDisplayModes() const override;
+    DisplayMode getCurrentDisplayMode() const override;
+    bool setVideoMode(const VideoMode& p) override;
 
     static void setWindowHint(int hint, int value);
 
diff --git a/src/Core/Platform/Window/IWindowBackend.hpp b/src/Core/Platform/Window/IWindowBackend.hpp
index 083da1c109..11613fffd2 100644
--- a/src/Core/Platform/Window/IWindowBackend.hpp
+++ b/src/Core/Platform/Window/IWindowBackend.hpp
@@ -3,8 +3,10 @@
 
 #include "Core/Utility/ActionDelegate.hpp"
 #include "Core/Platform/Window/VideoMode.hpp"
+#include "Core/Platform/DisplayMode.hpp"
 
 #include <string>
+#include <vector>
 
 namespace Core::Platform::Window {
     struct Dimensions {
@@ -30,7 +32,10 @@ namespace Core::Platform::Window {
         virtual void setTitle(const std::string& title) = 0;
         virtual Dimensions getFrameBufferSize() const = 0;
         virtual int getRefreshRate() const = 0;
+        virtual std::vector<DisplayMode> getDisplayModes() const = 0;
+        virtual DisplayMode getCurrentDisplayMode() const = 0;
 
+        virtual bool setVideoMode(const VideoMode& p) = 0;
         const VideoMode& getVideoMode() const;
 
         // Callback Registration
diff --git a/src/Etterna/Globals/StepMania.cpp b/src/Etterna/Globals/StepMania.cpp
index fb6911e03e..62f34a80ce 100644
--- a/src/Etterna/Globals/StepMania.cpp
+++ b/src/Etterna/Globals/StepMania.cpp
@@ -911,7 +911,7 @@ namespace StepMania {
         paramsOut.width = iWidth;
         paramsOut.height = PREFSMAN->m_iDisplayHeight;
         paramsOut.refreshRate = PREFSMAN->m_iRefreshRate;
-        paramsOut.isFullscreen = PREFSMAN->m_bFullscreenIsBorderlessWindow;
+        paramsOut.isFullscreen = !PREFSMAN->m_bWindowed;
         paramsOut.isBorderless = PREFSMAN->m_bFullscreenIsBorderlessWindow;
         paramsOut.isVsyncEnabled = PREFSMAN->m_bVsync;
     }
@@ -933,9 +933,10 @@ namespace StepMania {
     void ApplyGraphicOptions(){
         bool bNeedReload = false;
 
-//        VideoModeParams params;
-//        GetPreferredVideoModeParams(params);
-        std::string sError = "";//DISPLAY->SetVideoMode(params, bNeedReload);
+        VideoMode params;
+        GetPreferredVideoModeParams(params);
+        DISPLAY->SetVideoMode(params, bNeedReload);
+        std::string sError;
         if (!sError.empty())
             RageException::Throw("%s", sError.c_str());
 
diff --git a/src/RageUtil/Graphics/RageDisplay_OGL.cpp b/src/RageUtil/Graphics/RageDisplay_OGL.cpp
index 2b3d76cab4..6e6926fd15 100644
--- a/src/RageUtil/Graphics/RageDisplay_OGL.cpp
+++ b/src/RageUtil/Graphics/RageDisplay_OGL.cpp
@@ -524,6 +524,20 @@ void
 RageDisplay_Legacy::GetDisplaySpecs(DisplaySpecs& out) const
 {
 	out.clear();
+	// Prepare DisplayMode for following DisplaySpec
+	std::set<DisplayMode> available;
+	for(auto mode : this->window->getDisplayModes()){
+		available.insert(DisplayMode{
+			static_cast<unsigned int>(mode.width),
+			static_cast<unsigned int>(mode.height),
+			static_cast<double>(mode.refreshRate)});
+	}
+
+	// Current Mode
+	auto current = this->window->getCurrentDisplayMode();
+	DisplayMode m{static_cast<unsigned int>(current.width), static_cast<unsigned int>(current.height), static_cast<double>(current.refreshRate)};
+	RectI bounds = {0, 0, static_cast<int>(current.width), static_cast<int>(current.height)};
+	out.insert(DisplaySpec("", "Fullscreen", available, m, bounds));
 }
 
 static void
@@ -747,6 +761,7 @@ RageDisplay_Legacy::TryVideoMode(const VideoMode& p, bool& bNewDeviceOut)
 	// p.windowed, p.width, p.height, p.bpp, p.rate, p.vsync );
 
 	std::string err;
+	window->setVideoMode(p);
 	if (!err.empty())
 		return err; // failed to set video mode