I am confused by the "several files at once".  "Files" or "rows in a table" ?? or.....

rows in a table.

Tick them on the left side. Then right click and delete many at once.

Ahh.. Yes.. that would be helpful. "work around" could be to add a select check box.. and then write a script / button. :( 

Wow.. there are a lot of "hidden" gems in here.. :)   LOL

These optiosn don't appear for me. Only cut/copy/paste. Has this option been removed in an update? How can I now delete selected rows or delete multiple records.

At top left there are "Form" and "Table" buttons. Click the "Form" button and then try it. Seems a little counter intuitive, because you can delete more than the current form record. I am using the Ninox Cloud.

Clicking the "Table" button not only shows the list, it also puts you in edit mode so you can edit data while viewing the list. It initially places focus on a field. That appears to be the reason for the cut, copy and paste popup.

Got it, thanks.