On Mac, across all applications, including in other contexts in the Figma app, I use these shortcuts (⌘← and ⌘→) to move the text input cursor to the beginning or end of a line. But when in the “Find…” search field, it instead resizes the selected frame’s width/height. This is very irritating.
Also note: The behavior isn’t in the Figma shortcuts preferences panel, so I can’t change it there. And it isn’t in the app Menu bar, so I can’t edit the shortcut using System Settings.