Grid Lines disappearing from different viewports Unreal 4.25

I am just beginning my journey into Unreal (version 4.25) and using first person starter content.

However, the grids on the viewports keep disappearing. I have the grids correctly selected and scaled. I have tried resetting ‘show’ defaults.

Every time I delete the project from my hard drive and start again the grids return.

This issue was described in an older version of Unreal:

There does not seem to be a consistent reason for why they disappear. Even moving the first person camera 90 degrees on x axis removed them from the front view. That seems to make no sense so possibly a bug?

Anyone had experience of this issue or any solutions?

Got exactly the same in 4.25. Comes back double clicking the lightsource but goes away again when selecting something else.