photoshop 2026 get rid of "select subject remove background" box

As @creative explorer asked, that is the Contextual Task Bar. 

You can turn it on and off from the bottom of the Window menu.

I have added a shortcut to toggle it on and off using F3  (as you can see in the screenshot)

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There is an option to Pin the CTB which will cause it to remain wherever you place it.  I like to park it on n empty part of the Options bar.

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It is incredibly useful though, so give it chance to grow on you.  It makles a decent guess and placing the function you need next to where you are working on the screen.  Way faster than trawling though menus.