Primary menu in Woocommerce mystile theme issue

I’m using Mystile theme. the default primary menu is aligned to the right …if i add pages to the menu the new links show up on a new row which is not what i want. i want the links to stay in one row and not widen the nev bar. now I’m using the ubermenu and it is sized the same. how can i make the menu the same size regardless of the number of pages and links are in the menu ? i want to keep it the size of the theme frame

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