Button element Link

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I am trying to set a URL on the Button element using extended fields.

When I enter this url:

/advancedsearch/?search=[oxygen ct_sign_sha256='b067554b8c22000d00ddf5b64343a8872b4edef7966c781010edd871ff068865' data='custom_acf_link' settings_path='community_page' settings_page='false' ][#v_gallery](https://www.facebook.com/hashtag/v_gallery?

I end up with the following:

advancedsearch/?search=http://Big%20Hats#v_gallery

The field is a text field and the value is Big Hats

ITs adding =http:/ and %20 for the space