Hi @ofmarconi, thank you very much!
With the PRO version, to disable a plugin everywhere on the frontend, you have the settings Miscellaneous => DIsabled On Frontend. You can see more here: https://freesoul-deactivate-plugins.com/how-deactivate-plugiins-on-specific-pages/disabled-on-frontend/
However, you can reach the same goal also with the free version by using the settings Custom URLs => Plugin by URL. Click on the pencil and add *wp-admin* in the textarea of the popup.
Then the plugin will be active only if the URL includes wp-admin, hence only in the backend.
I hope it helps.
Have a great day!
Jose