I am working through this tutorial that I think was intended for 2.8x - https://www.qgistutorials.com/en/docs/making_a_map.html
Step 24 advises on how to add a grid on a map in Layout view. But there is no longer a CRS menu in Item Properties. In the tutorial, the grid appears when the coordinate reference system is set to WGS84 in the CRS Selector dialog box. Then the interval is set a 5 degrees. I have set the CRS to WGS84, but has not appeared on the map, and I don't see how to set the grid interval to 5 degrees.
How do I do this in version 3.0?
Here is the map with the version 3.0 Item Properties: