I assume you have set your security level to “I’m Under Attack!”. This mode is designed to be used as one of the last resorts when your website is actively being attacked. It is not recommended to always have I’m Under Attack Mode enabled, as it will impact traffic to your site.
This is not possible. If you want to protect specific actions on your site, such as submitting a comment or contact form, you can use Turnstile (a Google reCAPTCHA alternative) to help protect against bots.