I want to make a pop-up operation by clicking the button in the Node-red Sidebar. Inside the pop-up box is a list (left and right structure), which is a list. What should I do on Node-red, can I refer to it?
Do you mean in the admin UI? Which button and on which panel?
Really, those panels are internal to Node-RED with the possible exception of the info panel which you can influence by writing HTML in a custom node then selecting that node or an instance of it.
You should remember, however, that the admin UI is for administration - e.g. writing flows and configuring nodes. It is not meant as a general user interface. For that you should use Dashboard, uibuilder or something similar.