miauu's Tab Panel is a 3ds Max tool for arranging toolbars into a tabbed layout. It can convert existing toolbars into tabs, and it lets you create new tabs and fill them with action buttons. Tabs can be renamed, hidden and shown, and rearranged to suit how you want your interface laid out.
Beyond building tabs, the tool works in both directions: tabs can also be converted back into toolbars. This gives you a way to move between the standard toolbar setup and a tabbed panel without starting over each time.
Developed by miauu, the script is compatible with 3ds Max versions 2020 through 2026. Version 1.1.1 was last updated on 2025-04-07. A demo video is available, and more information can be found on the developer's page.