You can change the behaviour using Options dialog from Tools menu. Go to Text Editor, C/C++, Advanced, IntelliSense section, and set “Member List Commit Aggressive” to True.
However, this is not always convenient, because when you type “wi” and press “=” for example, it will insert the selected “window”, but maybe you wanted “window_width” or “wizard” or just “wi”, which were not selected. You will have to edit the insertion.
Currently “window” is focused but not highlighted. You can press <Tab> to insert it if it is appropriate; or use arrows for other choices.