Hey @KaziTouhid,
- The Expanded Font Family will display a sample text showing the actual font family below the font family when you select a font family.

- The Show All Documents will show all documents when you open up the document library.

- The Inset Preview makes it a bit easy to grab to resize the Preview window. See the difference below.
Inset Preview On
Inset Preview Off
The benefit of Inset Preview Off is you’ll have a wider and taller preview.
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Preserve Inspector Group will keep the Inspector or element options open of like elements. For example, you’re editing the margin of a text element. When you click on another Text element, you’ll see that the margin options of the current text element is open for you to edit. If Preserve Inspector Group is off, when you edit another element, you’ll be taken to the element’s setup.
