During my time working in Blender, I realized that I would like these functions to be quickly accessible directly from the main viewport header without navigating through a large number of tabs and searching among other functions in different kinds of menus.

So, this addon adds 4 predefined buttons (the buttons you need and their order can be selected in the addon settings)

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1.Scene units: 

The button allows you to quickly switch between units of length. When you click on it, a menu appears in which you can quickly select the desired unit.

In the addon settings you can choose which units will be in the menu to add only those that you most often use.

The button icon after selection will display a short designation of the selected unit for easy visibility of the unit that is used in the scene.

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2- Face Orientation:

Quick access button to display/hide the face orientation overlay. 

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3. Scene World Transparency:

Just click one button to make the world background transparent instead of going to the “Rendering Properties” tab and there under “Film” look for the “Transparent” checkbox to enable it.

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4. Scene world navigation & background intensity button.

Once you have set up the scene world - control its location, rotation, scale and intensity without switching to the world shading tab. Clicking the button opens a menu where you get direct control of mapping node and background intensity node.

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If you have any questions about this product, please use the “contact the creator” button.