It's set in the DVR's web UI and on the client.
Here is the log from tonight for WWE Smackdown and Bluebloods, the shows recorded on 35.1 and 6.1, respectively vs. the PRIME station 1035 and 806, respectively.
2021/01/22 22:00:00.516449 [TNR] Closed connection to 10771656/0 for ch35.1 FOX
2021/01/22 22:00:00.543441 [SNR] Statistics for "TV\WWE Friday Night SmackDown\WWE Friday Night SmackDown S23E04 2021-01-22-2009.mpg": ss=100% snq=100% seq=99%,0%-100% bps=9436912,0-13678880 pps=896,0-1300
2021/01/22 22:00:00.569514 [DVR] Finished job 1611363600-6 WWE Friday Night SmackDown
2021/01/22 22:00:00.569514 [TNR] Opened connection to 10771656/1 for ch6.1 WTVR-HD
2021/01/22 22:00:00.576571 [DVR] Recording for job 1611370800-2 from 10771656 ch6.1 into "TV\Blue Bloods\Blue Bloods S11E05 Spilling Secrets 2021-01-22-2200.mpg" for 59m59.9321969s
2021/01/22 22:00:00.883994 [DVR] Waiting 59m59.1160059s until next job 1611374400-38 DailyMailTV
2021/01/22 22:00:01.014231 [IDX] Generating video index for job 1611370800-2
2021/01/22 22:00:01.267398 [DVR] Processing file-3415: TV\WWE Friday Night SmackDown\WWE Friday Night SmackDown S23E04 2021-01-22-2009.mpg
2021/01/22 22:00:03.163098 [DVR] Running commercial detection on file 3415 (TV\WWE Friday Night SmackDown\WWE Friday Night SmackDown S23E04 2021-01-22-2009.mpg)
2021/01/22 22:07:50.427069 [DVR] Commercial detection for WWE Friday Night SmackDown S23E04 2021-01-22-2009.mpg finished with 22 markers.
2021/01/22 22:09:22.229106 [NAT] Successfully mapped port 8089 using natpmp
2021/01/22 23:00:00.002448 [DVR] Marking expired job 1611370800-2 Blue Bloods
2021/01/22 23:00:00.064881 [DVR] Starting job 1611374400-38 DailyMailTV on ch=[1035 35.1]
2021/01/22 23:00:00.065876 [DVR] Waiting 2h29m59.9351182s until next job 1611383400-38 DailyMailTV
2021/01/22 23:00:00.502176 [TNR] Closed connection to 10771656/1 for ch6.1 WTVR-HD
2021/01/22 23:00:00.532179 [SNR] Statistics for "TV\Blue Bloods\Blue Bloods S11E05 Spilling Secrets 2021-01-22-2200.mpg": ss=96%-97% snq=99%,94%-100% seq=99%,0%-100% bps=11858246,0-12022976 pps=1126,0-1142
2021/01/22 23:00:00.665067 [TNR] Opened connection to 1318B939/0 for ch1035 WRLHD
2021/01/22 23:00:00.673389 [DVR] Recording for job 1611374400-38 from 1318B939 ch1035 into "TV\DailyMailTV\DailyMailTV S04E165 2021-01-22-2300.mpg" for 29m59.9341233s
2021/01/22 23:00:00.897684 [DVR] Finished job 1611370800-2 Blue Bloods
2021/01/22 23:00:01.053849 [DVR] Refreshing metadata for DailyMailTV (14402640)
2021/01/22 23:00:01.117794 [DVR] Waiting 2h29m58.8822059s until next job 1611383400-38 DailyMailTV
2021/01/22 23:00:01.492775 [IDX] Generating video index for job 1611374400-38
2021/01/22 23:00:01.495772 [DVR] Processing file-3416: TV\Blue Bloods\Blue Bloods S11E05 Spilling Secrets 2021-01-22-2200.mpg
2021/01/22 23:00:05.618332 [DVR] Running commercial detection on file 3416 (TV\Blue Bloods\Blue Bloods S11E05 Spilling Secrets 2021-01-22-2200.mpg)