I'm developing a website which register customer is required to use official reCaptcha. But the client only want to implement reCaptcha on Website A, not Website B. The customer register form on Website B does not need to use reCaptcha. Is it possible to do so?
You can enable it for only one website by following steps:
Step 1: Login to admin, goto Stores -> Configuration
Step 2: Then goto Customers -> Customer Configuration
Step 3: Change the store or website configuration from "Store View" dropdown(at the top of left menu) to the store you want to enable captcha.
Step 4: Now Select tab CAPTCHA, You can now enable it for that selected store or website by enabling "Enable CAPTCHA on Storefront"(Uncheck the 'Use system value')