I frequently use MS Teams. As with every team created there's also a new site collection in SP online, I implemented a lot in such site collections.
However, one of my frequent tools in such SCs is the good old SharePoint calendar. It can be customized in the way as it was on SP 2010.
I wanted to change the behavior of the "new item" form, i.e. add some formatted text or information, but when I navigate to the settings of the calendar and select the form settings, I get the error message, that InfoPath doesn't support modifying the form for this list.
Do I have other means to customize the forms for new items in that list? If I try to open it with SharePoint designer, I apparently lack some rights to get all information. I only see some JSON gibberish when I open NewForm.aspx
On the other hand, PowerApps doesn't seem to work with "old" SharePoint calendar. Or did I miss something?