Are you sharing an AppleID?
If all your devices are sharing a common AppleID for iCloud, you’ll encounter all kinds of issues with unintentional and/or unwanted sharing of sensitive/private information (including account Passwords). You’ll not be able to reliably maintain any kind of data separation.
The Golden Rule: Don’t share an AppleID between users. Each user should have their own AppleID for their own exclusive use - linked to their own primary email (and secondary/recovery email addresses and trusted telephone numbers).
You would be best advised to separate your digital identities and configure a new AppleID for your spouse.
After separating your identities, you can continue to selectively share purchased Apple Services, Subscriptions, Apps and Media using Apple’s Family Sharing features - should you choose to do so:
Family Sharing - Apple
Set up Family Sharing – Apple Support
Share App Store, iTunes Store and Apple Books purchases with Family Sharing – Apple Support
How to create a new Apple ID – Apple Support
https://www.imore.com/how-set-up-family-sharing-iphone-ipad
Before transferring the iPad to a new user, the iPad must be properly prepared. This procedure will fully erase the iPad, removing both sensitive information and the Activation Lock that will otherwise cause difficulties for the new user:
What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support
Once prepared, the new owner can set-up the iPad “as new” from the initial “hello” screen - creating a new AppleID account if necessary.