Did you turned on astra pro modules?I have updated this 3.5.8 version on one of my sites, and no problem with the footer there. Yesterday I had started a new site and uploaded the same 3.5.8 version, and I can't style my Widget.
Widget Styling options are not available.
Edit: I have tested the 3.5.8 version on a local server with a fresh WP install, and there is also the same problem (No Styling Options for Widgets)
@Babak @2GB Please have a look.