There are different settings you can adjust to not show hdr, but that is not going to prevent blooming. Blooming is only more noticeable in HDR because HDR content defaults to higher (often max) brightness and contrast levels in the settings, and blooming is caused by uneven backlighting based on that brightness/contrast. So if you want to truly control blooming, you are better off experimenting with the calibration.

There are guides on this reddit and on youtube, but much of it will depend on how you view content. Do you watch in a brightly lit room or in the dark? Do you have any ambient light sources while in that dark room that you wouldnt mind using? Do you often use subtitles? Things like that

Just be aware that you can have blooming without HDR if all of your settings are maxed out in a dark room, but you can also have HDR without maxing everything out. Also be aware that some level of blooming is just a result of how the tech works. The goal is to minimize blooming so the edges of the pictures arent overly obscured, and to make sure subtitle text is legible. If you are bothered by even the slightest bit of black bar lightening, then you really should gravitate toward an OLED. People have mentioned the Q90 from samsung and that tv has way more dimming zones and excellent brightness, but that also ends up crushing some of the black detail in shadows and other dark scenes, whereas shadow detail on an LED is a strong point for sony. You kind of have to pick your poison.