The top bar in Studio is called the Quick Access Toolbar and contains shortcuts to various buttons and commands in Studio. You can freely add, remove, and rearrange actions in the toolbar.
To customize the Quick Access Toolbar, click the dropdown button to the right of the bar. This dropdown allows you to quickly enable and disable buttons from the bar.
To add and remove buttons, as well as change the order of the buttons, select Customize in the dropdown menu. Here you can search for actions and manage the buttons that appear in the toolbar.