It looks like the feature for RcloneView to live in the system tray is not working on Linux Mint 22.3 Cinnamon 6.6.6. I am using the XApp Status Applet for my system tray (for applications which use XAppStatusIcons).
It may be related that I keep getting the below notice, even though I am not running in a Gnome desktop.
I also have this problem - newly installed Rclone View on Linux Mint Cinnamon desktop - no system tray icon. Plus I have the GNOME extension installed.