Buddyboss sidebars

Hello. I have a Buddyboss site and I have a CSS code to be able to bring widgets to the top of the page (i.e. above the activity heading). This link is the help from Buddyboss explaining how to do this: https://support.buddyboss.com/support/solutions/articles/72000598288-display-activity-feed-widgets-above-activity-posts-in-mobile. However, it brings ALL the widgets to the top and I would only like a specific widget (I am creating a widget gallerty). How may I bring only a single widget to the top of the page and hide the rest, please? Your expertise would be most gratefully recieved. Thank you.