OS: Windows 10 - 64-bit
Video volume has three different states, 1 for browser, 1 for fullscreen, 1 for viewer.
To reproduce:
1. In Settings > Interface > Switching mode > set option for 2x click to "Browser>Fullscreen>Viewer".
2. Focus any video file in browser and set the volume to 0% (mute)
3. Click the "View" toolbar button to go to view mode
or
3. Double click the video file thumbnail to go to fullscreen
Actual behaviour (bug): Video volume is not at 0%

Expected behaviour: Video volume should be the same in all modes.