windows keeps switching my default browser back to edge

Settings, Apps, Default apps, click Chrome, Set default at the top, and then also scroll the list and set http, https, .htm and .html one by one. The big button sometimes misses one and that's the one that flips after an update. Two things worth knowing: results from the Windows search box and the widgets panel always open in Edge whatever you set, that's by design and not your default reverting. And Edge updates sometimes pop a make Edge your default prompt that's easy to accept without noticing. If it genuinely keeps resetting, Chrome's own settings have a Default browser section with a Make default button, ten seconds after each Windows update.