docs: add section with layout configuration settings (#2037)

docs/docs/configuration/settings.md

@@ -39,7 +39,7 @@ The configuration file, `configuration.json` is in the Oni2 directory, whose loc
 
 - `editor.largeFileOptimizations` __(_bool_ default: `true`)__ - When `true`, Onivim will turn off certain settings like syntax highlighting for large files.
 
-- `editor.lineNumbers` __(_"on"|"off"|"relative" _default: `"on"`)__ - Controls how line numbers are rendered on the editor surface
+- `editor.lineNumbers` __(_"on"|"off"|"relative"_ default: `"on"`)__ - Controls how line numbers are rendered on the editor surface
     - _"on"_ - absolute line numbers are displayed
     - _"relative"_ - the absolute line number of the line with the cursor is displayed, other line numbers are shown relative. (This is helpful for motions in Vim!)
     - _"off"_ - do not render line numbers.
@@ -72,6 +72,16 @@ The configuration file, `configuration.json` is in the Oni2 directory, whose loc
 
 - `workbench.tree.indent` __(_int_ default: `2`)__ - Indentation of the tree explorer.
 
+## Layout
+
+- `workbench.editor.showTabs` __(_bool_ default: `true`)__ - When `false`, hides the editor tabs.
+
+- `oni.layout.showLayoutTabs` __(_"always"|"smart"|"never"_ default: `"smart"`)__ - Controls the display of layout tabs. `"smart"` will only show the tabs if there's more than one.
+
+- `oni.layout.layoutTabPosition` __(_"top"|"bottom"_ default: `"bottom"`)__ - Controls the position of the layout tabs.
+
+- `oni.layout.singleTabMode` __(_bool_ default: `false`)__ - When `true`, groups will only hold a single editor, and closing this editor will always close the group. It will also hide the editor tabs, and therefore essentially hide the concept of editor groups.
+
 ## Rendering
 
 - `vsync` __(_bool_ default: `false`)__ - Whether rendering should sync with vertical retrace of the monitor. VSync adds input latency, as rendering must sync with the refresh rate of the monitor, but it reduces screen tearing.