A white screen right after activating a plugin almost always means a fatal PHP error is occurring before WordPress can render anything.
This typically happens when the plugin is incompatible with your PHP version, conflicts with another plugin, or calls a function that no longer exists.

The fastest way to confirm this is to enable error logging by adding define('WP_DEBUG', true); and define('WP_DEBUG_LOG', true); in wp-config.php. Reload the page and check wp-content/debug.log. You’ll usually see the exact file and line causing the crash.

Once you know the source, deactivate the plugin via FTP or file manager by renaming its folder. If the error mentions PHP 8.x issues, downgrading PHP temporarily or updating the plugin often resolves it. In some cases, replacing deprecated functions manually can be a short-term fix.

A common mistake is assuming the theme is at fault when the timing clearly points to the plugin activation.
The practical takeaway is to always check PHP compatibility before activating plugins on production sites.