Sidebar for searching data purpose

So I've been redesigning this website when a user fill in a form, the also can search tp fill one of the text fields. the previous design is when users clicked on search button, they displayed a pop up with another filled in form and data result in a form of a table. What I wanted to do now is changing the popup into expanding sidebar.

Is it better using sidebar or should I use the previous ux with popup? thank you