Hey @dzoker23, yes you can.
Go to Ultimate Member > User Roles > ‘User Role’
In the options for the selected user role, scroll down and you’ll be able to see ‘Registration Options’ Use the registration status drop-down, and select ‘Require Admin Review’
Then in your WordPress settings, make sure this user role is the default for when people sign up to the site.
Users will be given this role when they register to your site.
Depending on how you set up profiles, other users might be able to still see their profile, and it might show as ‘This user account status is Pending Review’
Personally, I have a special role for users that are waiting for admin approval. Which only admins can see. But this also requires you to approve their account, and then update their user role too.