The screenshot shows a 1st & 2nd ending over bars with G6 chord symbols underneath the brackets, forcing them to occupy otherwise free space between systems.
Back in the day near the end of May before I bought this app in June (there should be a rhyme here), Sibelius used to let me slide the chord symbol, and the note beneath it, a bit to the right, and then the ending bracket would snap down right snug over the measures as though the chord symbols weren’t there. This was a blessing and a time- and space-saver. In my inexperienced state I tried a while unsuccessfully to find a similar trick with Dorico. Was there one to be found? I even looked in Properties windows this time. I am learning, however slowly.