Here is a copy/paste of setting the timeout.
Passcode requirements in your Square POS App
Once logged in using a personal passcode, team members can accept payments which will appear in their individual sales report, and take other actions specific to their permission set.
Open the Square App and sign in with your owner email, or a device code. If you sign in using a device code, be sure to enter your passcode with permissions to manage settings.
From the navigation menu, tap ≡ More.
Tap Settings > Security > Passcodes and toggle on Passcodes.
Under Require passcode, select between After each sale and/or When backing out of a sale.
Tap Timeout to select how long your point of sale can be inactive before locking.
Here is the link to the page.
