Questions about pdf editing

When I check the highlight button, I can set the selected text to be highlighted. The trouble is that when I select the text again and try to copy it, the highlight button is not released, so my selected text is highlighted again, but I can’t copy it.
What I’m asking is how do I release this tool on the toolbar, after I use it.

Tap the highlight button again.

I tried the “click button again” action, but it didn’t work.
I can’t release the button, whether it’s highlighted or underlined or anything else.

Select a different tool, e.g., the Annotation Selection tool. This is also available in the Tools > Document: Mode submenu.

The text is actually still selected right after highlighting, it’s not necessary to select it again.