How to change the look of icons on the left

Hi there. I have Pycharm installed on both of my PCs, one of them have the "structure", "terminal" (and so on) buttons at the left as large icons like the picture below:

But on my other PC, the interface looks like the picture below. Those buttons on the left are smaller and harder to hit on. How do I make those buttons look like the ones on the picture above? I appreciate for any help!

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It seems like a third-party plugin's affection, please refer to

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Hi community,

So I found the answer myself. It's 3rd party plugin Material Theme UI's affection. 
If you go to Settings > Appearance & Behavior > Material Theme UI > Settings > "Features" tab, and check the "Large Tool Windows (Experimental)" box,  you'll get the same big tool icons.


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