If you decided to add several menu items to main menu and ,as a result,there is not enough space and menu items shift to second line,just enter header.php to make menu section just a little bit wider.Edit bootstrap classes like in screenshot below
This can be done in WordPress Editor,wp-dashboard–>appearance–>editor or in header.php on your server.
Don’t forget to copy/paste edited header.php to child theme folder otherwise all changes will be lost after theme update.
