Uninstall the add-in

Unload MyToolBelt from Excel first, then remove its add-in file if you no longer need it.

1. Open File > Options > Add-ins. Select MyToolBelt and note the file location shown below the list.
2. Beside Manage, choose Excel Add-ins and click Go.
3. Clear the MyToolBelt checkbox and click OK. The ribbon tab should disappear.
4. Save your work and close all Excel windows. In File Explorer, remove the MyToolBelt .xlam file from the location you noted.
5. If a stale MyToolBelt entry remains in the add-ins list, select it. When Excel says it cannot find the file and asks whether to delete it from the list, choose Yes.

Unchecking the add-in is enough to disable it temporarily. Keep any custom icons or other files you want to use again.