Pashan

Preferences > Keyboard Shortcuts > Layer > Rasterize

Hi Pashan,

Does this happen on any document? It sounds like the dialog has opened up on what could have been a secondary screen. If you press Escape on the keyboard after going into the Document Setup can you then return to using the application?

I think illustrator costs more money than affinity designer.

There’s a little ‘trick’ that I found which you can use to quickly create a grid.
The ‘trick’ part is to duplicate the first line and move that duplicate to the other side of the area, then duplicate the pair. If you duplicate the lines all in the same place before trying to distribute them they will all stay in the same place, unless you use manual spacing.
See my attached video.
As MEB said above, this grid doesn’t work the same way as in Illustrator but it’s a start.
2020-04-20_14-57-30.mp4

Hi Pashan,
Welcome to Affinity Forums
Illustrator treats grids as objects. Affinity apps do not. Currently it's no possible to do this unless you create all the lines manually (you can use Power Duplicate to speed up the process), then group, rotate and lock them. Illustrator has more than two decades of development and a much more larger team, Affinity Designer has six years - some tools are still missing/being developed.

Change DPI in Document Setup?

Nope.

I think the question I asked earlier - quoted above - needs to be answered.
If we don't know what they mean by the question, we might not be able to give them the right answer.

Try selecting another option than "Solid" int the dropdown menu @G13RL show you

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Do they mean that the Gradient Palette in the Swatches Panel is empty?