Disabling modules is very simple, each tab in the UiPress settings represents a module. Click the module you want to edit and the first option will be the option to disable the module.
Once happy with your settings, press save and your settings will be applied. To see any visual changes you may need to refresh the browser.
Below is a screenshot of the WordPress admin with the admin menu module disabled:
Disable Module By Username / Role
Some modules also have the option to conditionally disable by role or username. This option can be found below the option to disable the module completely.
If you add roles or username then the whole module will be disabled for matched users.
If you are the first user on the site (id: 1), your role will be classed as super admin. So added administrator will not disable anything for yourself.