humbug.... do what I do.
Rather than splitting and deleting..... highlight both tracks, but put your mouse on the timeline at measure 3 and simply drag back into measure 1 (in this case). You will see the timeline turn dark gray where you selected it....and the tracks will mirror that selection as well. Then, simply process audio for GAIN and select the MUTE function from the drop down, click OK and that selected area in both tracks will process to MUTED.
If you get the selected area wrong..... no problem, simply click and drag the new area and it changes instantly..... as many times as you need to get it correct.
no need to split or delete anything.
I use this method all the time to clean up guitar and vocal tracks..... you can make the processed area very surgical by zooming in as far as you need.