Document visibilityPresetsBlacklist

Author: manisandro

src/configuration/ThemesConfiguration.md

@@ -219,6 +219,7 @@ The format of the theme definitions is as follows:
 | `},`                                            |                                                                                  |
 | `"layerTreeHiddenSublayers": ["<layername>", ...]`, | Optional: list of sublayer names to omit in layertree (but still displayed in map). |
 | `"predefinedFilters": [{<filter_config>}, ...]`, | Optional: predefined filter configuration, see [MapFilter](../references/qwc2_plugins.md#mapfilter). |
+| `"visibilityPresetsBlacklist": ["<name>", ...]`, | Optional: list of visibility presets (QGIS layer themes) to exclude. You can use`*` as a wildcard character. |
 
 
 A bare minimum theme entry might look as follows: