I can't disable the custom main manifest

Hello, I am having problems when unchecking (custom main manifest), even if I click on the box it does not change the status. I uninstall unity and reinstall it and the problem persists. There is some other way of unchecking that I don’t know from the graphical interface, the unity version that I am using is 2019.4.38f1 LTS.

Thank you

Go to the folder with the file - Plugins/Android and physically delete the file manifest.xml. This will disable the option and you’ll be able to build with the default manifest.
PLEASE BE SURE TO BACK UP the file before you delete it.