Steps To Enable Remember Me Functionality In Magento 2
1. Log in to Admin Panel.
2. On the Admin Panel sidebar, go to Stores > Settings > Configuration.
3. In the left panel, choose CUSTOMERS > Persistent Shopping Cart.
4. Expand the General Options section.
5. Untick Use system value and Set Enable Persistence to Yes.
6. Same as above, set Yes for Enable “Remember Me” field.
7. Click Save Config when complete.
You can see the Remember Me checkbox displayed in the Login form.
