nikolabt
Hi,
You can change via the Bootstrap classes in following files:
root/templates/ja_hotel/tpls/blocks/header.php
change: <div class="col-xs-4 col-sm-2 logo">
to: <div class="col-xs-4 col-sm-2 col-md-4 logo">
root/templates/ja_hotel/tpls/blocks/mainnav.php
change: <nav id="t3-mainnav" class="navbar navbar-default t3-mainnav col-sm-10 pull-right">
to: <nav id="t3-mainnav" class="navbar navbar-default t3-mainnav col-sm-10 col-md-8 pull-right">
As you can see that I add 'col-md-4' class for the logo div in header block and col-md-8 for the mainnav, you can increase the value as you wish but make sure that the total grid is equal to 12. You can check this reference for more info: https://getbootstrap.com/docs/3.3/css/#grid
Regards