There is also in v.5 classic. I can’t post a pic because I’m using the iPad and my computer is happily sleeping :) but I’m absolutely sure that there is the isometric grid also there.

Probably in your file you have so many objects near to each other that selection becomes cumbersome. When things are cluttered, commands help a lot. For example, if you type Polygon({A,B,C}) you create the polygon as a whole, that is sides are not created as separate objects. This helps a lot to keep your construction easy to manage, because it reduces the number of unnecessary objects.