There is no general button for bigger fonts, because such a feature would be game depended (e. g. Ark Nova). In fact, I know only very few games here on BGA using different fonts for better readability (normally when the original font type is rather fancy). Some card games using standard cards do offer a larger version of the cards. Maybe the tooltips help, which you can find in most games, when you hover over a card etc.
Then in some games you may zoom the playing area or parts of it, either directly in the playing area (usually identified by a magnifying glass icon), via the hamburger menu (three horizontal lines) in the top right corner or by clicking the gear icon in the player panel. If this is not large enough for you, you may also try your browser zoom.
I hope some of this helps
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Language is a source of misunderstanding. (Antoine de Saint-Exupery: The Little Prince) But it is also the source of understanding - it all depends on how you use it.
