Attempt to make modifier key changes take affect when the dialogue closes. This means you don't have to restart Fenrir to apply them.

config/settings/settings.toml

@@ -49,6 +49,7 @@ multi_press_timeout_ms = 200
 layout = "desktop"
 # Unset uses the layout's Fenrir keys, excluding configured script keys.
 # The Keyboard tab checkboxes save an explicit selection that overrides the layout.
+# Saved modifier changes apply when the menu closes and all held keys are released.
 # Names: KEY_KP0 (NumLock off), KEY_INSERT, KEY_CAPSLOCK, KEY_META (both Super keys).
 # A physical key cannot serve as both a Fenrir key and a script key.
 # fenrir_keys = ["KEY_KP0", "KEY_INSERT", "KEY_META"]