Both replies have been taken note of, Thank you!

Hi.
Yes user interface can be customized using the developer tools available in the odoo ui without studio.

For example, if you need to change a view, you can create a inherited view from the user interface and make the needed changes.

See:  How to Add Custom Field From User Interface In Odoo

Thanks

Hi,

Go through Settings > Technical > Menu Items. We have an option to reorder the sequence and delete menu items.

Hope it helps