Hey @helene44! Yep, absolutely! Assuming the form is set as your default in the overall plugin settings, then from the editor for the page/post that you don't want it to show up, you'll want to select 'None' (or an alternate form) instead of 'Default' on the editor for it, in the ConvertKit section. That'll make the change for that post/page only, while leaving the default as-is for your remaining posts/pages (unless you also override it from their settings in the same way).
As an aside, in your form's Advanced Settings (3-gear icon from the right toolbar of the form builder), you can also set it to not show to visitors who we've detected as already signing up for it:
This isn't 100% foolproof because if someone visits from a different device/browser we may not be able to identify them as a previous subscriber, but it is useful to help mitigate it in many cases! :)
We also have a comprehensive guide on our WordPress plugin & its various features here42 in case you haven't checked that out yet :) But of course, let us know if you run into trouble!
I hope that helps!