Left Click -> Set Size (Window)
Right Click -> Save the Size or second click delete the size
Left click after Save the size -> you can copy the size on any other item that have the Option

Just to clarify, I am having this problem on the gardendeko Linux + Windows mod, but there doesn't seem to be any help through that mod discussion there. I did post there, but I didn't get any response.

It's sometimes hard, if not impossible, to target one item when it is somewhat overlapped by another item when I am trying to resize item.

(I kind of think it would be nice if the sizing was part of the placement part. You know. I want it here click, find desired rotation click, select size final click. Just a though.)

Rotation shows mirrored on all ivy. I'm not sure if it is with other things as well, but the ivy for sure. Once you click for placement and it switches to rotation, what it shows you is the mirror of what you get.

Some of the hanging ivy increases in size from the bottom up and out, rather than down from the hanging point and out. Wall Plants 1,4,5,6, and 7

I still can not get flower tool to work.

Are there any commands I could use to hide specific ivy so I could change size of others, and then show the hidden ones again?