Collabora Calc on iPad - Sheet Menu not accessible

I’ve recently installed Collabora Office on my iPad & I’ve been trying to use the spreadsheet but I’ve run into a problem. I can create new sheets but I can’t rename a sheet, move it or delete it. On the Android version, a long touch on a sheet tab brings up the menu which allows me to do all the things I want to a sheet, but a long touch on a sheet tab on my iPad does nothing.
Is there a different method on the iPad for accessing the sheet menu or is it a bug?

I think this is a bug, Would be good to report over at Issues · CollaboraOnline/online · GitHub