mobile - Apps CTA buttons shape - User Experience Stack Exchange

Debating what should be the shape of different buttons and CTA's on my apps (both iOS & Android). The design guidelines of Google/Apple are tending toward the simple rectangle w/o rounded corne

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Is it better for UX to place both 'close pop-up' button and 'back' button on the same direction (both on the top left for example)? How do you make such a decision?

forms - How should I place 3 equally important CTA buttons? - User Experience Stack Exchange

Buttons] Stacking primary and secondary CTA on mobile · Issue #5636 · carbon-design-system/carbon · GitHub

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