I have a next.js app using v7 of the APS Viewer. At the size that we want the window to display, several buttons on the toolbar are missing. Make it wider, they reappear. The only way I’ve found to stop this is to remove these buttons, and re-add them. However, when I do this, some of them do not work anymore. What am I doing wrong, and do I need to do this at all? Eventually, I want to add extension functionality to custom buttons, but it is not at all clear how to do this from the documentation.