How shall I connection the screams when the small blue circle doesn't pop up?

Hi @Yiling_Quan

Only frames, or elements in a frame, can be used to connect two screen together.
If it didn’t solve your problem would you be able to share a screenshot for us to understand better?

Hi,
Thanks for your help, I tried several times, like
my whole page could not connect

you selected rectangle that not in a frame, place it and button inside frame, then you will be able to create connection.