Question re: post installation of MacOS Sequoia on iMac Late 2015 - 17,1 (27 Inch, i7, 4.0ghz)

Question re: post installation of MacOS Sequoia on iMac Late 2015 - 17,1 (27 Inch, i7, 4.0ghz)

It took a few go's but I finally have it on my system and all seems to be running well thus far (touch wood). My question is, once the process is done, how do I stop it from taking forever to turn on and reboot after turning off (with all the white writing on the black screen). I have opted to have it bootable from drive but have not yet removed the USB (I'm worried if I do it will ruin everything - It was a hard road getting the upstage on and function in the first place). Any advice appreciated. This is what my disk utility looks like now

https://preview.redd.it/4pt740qifwnf1.png?width=2312&format=png&auto=webp&s=5884302da4452b48f6ea84ccc4d0e48227b2d33a

submitted by /u/Major-Letterhead-161
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