Viewport help.

Development Getting Started & Setup
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  1. How do I turn ON Grid lines in the editor viewport?

  2. How do I make the X/Y/Z gizmo/gimbal BIGGER, and reposition in the top-right corner?

  3. Is there a way to ‘re-assign’ the Rotate view feature, from the Right Mouse Button? I can’t find it.

  4. How do I ‘flip/ invert’ the direction in which the viewport rotates across the X axis?

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Hey @GameGuruGhandi, welcome to the community!
If you go to Show, you should be able to find all the grids you can, otherwise, the grid may be visible, yet transparent.

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If that’s not what you’re looking for, there is a button with 4 squares at the top-right corner, that may open a viewport you’re looking for.
I’m not certain about the X-Axis particularly, but I know you can invert the Y axis in settings, so you may have some luck there:
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As for the RMB problem, I’m not entirely sure that the viewport rotate is one of the changeable features in Unreal without digging into the Source.
I hope this can help,
-Zen