It really surprises me how many people don't realize that manual spotting is still a thing.
The target acquisition in this game is absurd, and it is a problem, but manual spotting definitely still exists.
Basically, how it works is that the game automatically places red dots above any and every enemy's head that is both remotely near the center of your screen and also within ~35m of you. These red dots are ONLY visible to you, but this system is overly generous and problematic in that it gives away enemy positions far too easily, and allows you to quickly follow up with a manual spot which will then communicate their locations to your team in a similar fashion, as well as painting them on minimap.
This post does a good job at explaining this mechanic, complete with screenshots: https://forums.ea.com/discussions/battlefield-6-beta-feedback-en/bf-vet-beta-feedback-game-pacing-is-too-fast-3-easy-fixes/12478776