Lock the size of simples


Is anybody know a way to lock the size of simples (a square for exemple)?
On my phone it’s appear stretched by the sides (letf to right)…so, now it’s a rectangle. Very ennoying…
I think the simple ones adapt to the size of the screen, in itself it is not disturbing but I use them as a button and I would like their size not to change.
Excuse my english, I’m using google translate =)

Thank you to anyone who can help me!

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