Read trash guides.
But to answer your question:
You set a threshold and max-upgrade score.
Based on your custom format scoring and then searching your sources you need to surpass the treshold to auto-download.
If the upgrade-until score is achieved anything beyond that wont be upgraded.
720p = 20 pts
1080p = 100 pts
Web-Rip = 20 pts
Web-DL = 100 pts
BluRay = 150 pts
x264 = 50 pts
x265 = 100 pts
Uncut = 5 pts
FLUX = 20 pts
SubsPlease = 100 pts
Threshold score: 150
Max upgrade score: 400
By that logic the title MovieTitle.2009.720.Web-DL.x264-FLUX would score 190 pts.
Your threshold is 150 pts. Since it surpassed the threshold it will be downloaded.
Radarr searches 10h later again from the RSS feed and finds the title MovieTitle.2009.1080.BluRay.H264-SubsPlease which scores 350 pts.
It crosses the treshold of 150 and has a higher weighting than the 1st download and will replace the first download.
Next day radarr finds a new title (again) with the title MovieTitle_2009_1080p_BluRay_H.265_uncut-SubsPlease. The score of that release is 455.
You crossed the score of threshold and max upgrade. Radarr doesnt download anymore.
Besides that you can set radarr to only download between 1080p and 1080p-bluray but anything below (<720p) and over (>1080p-bluray like 4K) wont be downloaded.
How you weigh the score depends on your decision.
Some value resolution and a specific audio codec, some give the uncut version a higher score than the theatrical release (e.g. 20 pts vs 5 pts) and another one chooses HDR is very important and gives it a trumping score of 500 pts.
The value is arbitrary. It can each be a score of 10, 100 and 1000 or just 1, 10 and 100 pts.
Important is to set the rules according to your scores.
And for more advice, read the trash guides. https://trash-guides.info/Radarr/radarr-setup-quality-profiles/
For more question you should visit the !piracy@lemmy.dbzer0.com lemmy piracy community. There are more users that can help you with those questions.