The applet is called drivemount, and it's part of gnome-applets. By the way, you can use this command to use light icons which will have better contrast:
gsettings set org.gnome.desktop.interface icon-theme ubuntu-mono-dark -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1947553 Title: wrong panel size 21.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/1947553/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
