For me, adding so many columns in a screen, and you have to scroll horizonlly is not a good idea. instead, you can add more rows and scroll vertically, and in one row you have 4 or 5 cells (can not too much).
to make a round corner layout, you can use this extension:https://kevinkun.cn/enhance
and in case you need a list of more than 100 buttons in order, you can use this extension
Extension to create/remove visible components dynamicly.
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