There is a text on panel. It is a minimal that may be

Panel example

Same panel with a header text.

Another panel example

Same panel with an icon.

Code

Expandable panel

Collapsable panel

You can hide this text. Just click a collapse button in a panel header.

Removable panel

It is just a panel.

Code

Click the wrench button and get a result. You can add a custom list of submenu items.

All available buttons

It is a maximum of available buttons in a header.

Panel with custom header buttons.

Code