Apps are installed.
Try this. Go to ‘Manage apps’, far left below on your phone.
Swipe to an app that you use less.
Tab on the app and tab on ‘uninstall’
Go the ‘System settings’, far left below on your phone.
go to 'Storage’
Make the ‘SD card’ your default write disk.
Now install the app again.
It’s likely that by uninstalling you delete your settings for that app.