Hello @tim2329
To change the footer menu from the default vertical appearance to horizontal one at first you need go to Admin Panel / Appearance / Customize / Advanced Settings / Custom CSS.
Here you will see a text-box to write custom CSS. Here copy and paste below CSS.
.col-md-6.footercol2 .widget_nav_menu ul li {
display: inline-block;
}
Hope this will help to resolve your issue.
Let us know if you have any confusion in achieving this result.
Regards!!