Export app Tablet compatible (Android)

I have 3 apps on the play store and when I try to download on a tablet say that my app is not designed for tablets and I can’t download.

How can I solve this? Thanks!

The filtering on the play store is based on the contents of the apps manifest. You have to avoid declaring permissions that aren’t supported on tablets (like telephony) and you must specify compatible screen sizes. You can read more about it here and here (especially points 9 and 10)

There’s also an older thread on it here with some more discussion.