Why does my Rectangle Marquee Tool have rounded corners in Photoshop?

Question

I don’t know why, but every time I use the Rectangle Marquee Tool in Photoshop, the corners appear rounded instead of sharp. It’s caused me a lot of problems — I just want to create a simple frame around an image with straight edges. I’ve already tried all the suggested solutions I could find, but nothing worked. Any idea what might be causing this?

Semaphoric · Accepted Answer

What you are showing is Stroke controls for a rectangular Shape layer, not the Rectangular Marquee tool.

Peru Bob · Answer

Try resetting the tools and/or preferences.
To restore preferences quickly using a keyboard shortcut:

Press and hold Alt+Control+Shift (Windows) or Option+Command+Shift (Mac OS) as you start Photoshop. You are prompted to delete the current settings. The new preferences files are created the next time you start Photoshop.
Note: Using the keyboard shortcut, preference files for custom shortcuts, workspaces, and color settings will also be reset to default.

from here:

https://helpx.adobe.com/photoshop/using/preferences.html#restore_preferences

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