On my side, it doesn't have that issue. Test on a blank project if your side still have issue. Also it's best to make a question on my Discord cuz this thread is gonna be flooded with images 😂
Viewing post in Alternative Scene Options - RPG Maker MZ Plugin comments
Sorry, I won't add more pictures to this thread :D
But I opened a blank new project and place only two of your plugins (Alternative Scene and Keyboard-gamepad) and I still have the same issues.
Also, when I tried to put fullscreen or mastervolume it doesn't worked at all.
I add masterVolume to the symbol of Audio side
and fullScreen to symbol of Video side
It does appear in the windows sides and even allow me to move the volume or change On/Off, but it doesn't work (doesn't make any change to the game screen or volume).
(I'm also using Visustella options core btw)
Make sure you use a fresh version of the plugin. As you can see on my pictures, I didn't have that issue. It's best you send me a demo via Discord (direct message) and I'll check that. Although I can't guarantee to make it work with other people plugin. I can only make it work in standard RPG Maker environment.