Help w/ Construction

Hi! Can anyone help me? I have three questions:

1 How can I use the editing group and selection tool to choose specific items from the group, like shown in the picture?

2 I've watched many videos on constructions, and most of them use a circle to create large geometric constructions. How can I properly use this technique to achieve the same effect? (I'll include a picture because my explanation might not be clear enough.)

3 I have a good computer with a 4060ti (with nothing on the map, I get over 300 fps), but when I place about 10 habitats with lots of plants and rocks, my fps drops significantly. Has anyone else experienced this issue? I don’t think my computer performs poorly with other games, but Planet Zoo seems to run quite laggy (around 60 fps). Have any of you managed to finish a fully built map without experiencing lag?

English isn't my first language, so I apologize for any grammatical errors
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