Resizing
The ToolBar component is designed to hold different UI controls such as buttons, button groups, toggle buttons, split buttons, and more customized elements.
By design, the ToolBar detects changes in the viewport width and automatically shows or hides its elements according to the available space. The overflowing controls are hidden in the command overflow popup (a burger menu with a three-dot icon).
This functionality is provided by default and may be disabled by setting the Resizable() option to false. To control how a given ToolBar command behaves on resizing, set its Overflow() option to Never, Always, or Auto.