I upgraded from 2.7.4 to 2.8.0 today.
I used to be able to click on a channel in Tab 1 to select it.
In Blind Spreadsheet, I could select channels by clicking or double-clicking.
Neither of these work any more.
Clicking and double-clicking on a channel in a magic sheet still works to select channels.
the clicking depends on Setup>Device>Displays>In-cell editing
I just tested this on a Nomad 184.108.40.206 install on my laptop and it works as it always has here, I can select by clicking on the tombstones or in the boxes in spreadsheet view. Whatever I click on appears in the Command Line as expected, Live, or Blind, or Blind spreadsheet.
I do have "In-Cell Editing" enabled in Setup > Device > Displays