Pointing to Login or Sign UP window directly

HI,
Is there a way to assign the two buttons:
Sign up
and
Login
to directly open both mode of this window.

At the moment, button opens the Sign Up mode and user has to click the Login option at the bottom
,have 2 existing “Sign In” “Pop UP A” and “pop UP B” elements in the Editor…but they pretty look the same to me…
Any idea before I start creating my own 2 windows ?
Tks!

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