one Google map marker tooltip at a time

the trick is that the code of ismael is absolutely right : but he has forgotten to mention that the one thing has to put globaly on top:

look on top of the google maps function on shortcodes.js:

// -------------------------------------------------------------------------------------------
// 
// AVIA MAPS API - loads the google maps api asynchronously 
// 
// afterwards applies the map to the container
// 
// -------------------------------------------------------------------------------------------

(function($)
{
    "use strict";
      var openedInfoWindow = null;

…

under the use strict that line: var openedInfoWindow = null; is missing in the info of ismael !

so :

on top of the avia map function

"use strict";

replace with:

"use strict";
var openedInfoWindow = null;

and:

google.maps.event.addListener(marker, 'click', function() {
                    infowindow.open(map,marker);
                });

replace with:

google.maps.event.addListener(marker, 'click', function() {
                    if (openedInfoWindow != null)
                        openedInfoWindow.close();

                    infowindow.open(map,marker);

                    openedInfoWindow = infowindow;

                    google.maps.event.addListener(infowindow, 'closeclick', function() {
                        openedInfoWindow = null;
                    });

                    google.maps.event.addListener(map, 'click', function() {
                        infowindow.close();
                    });
                });

see here working example: https://webers-testseite.de/weber/google-map-only-one-marker-open/

this is the header option: logo top menu under logo.
in this case the menu is not part of av-logo-container so it can be set to display: none

the logo is part of the menu – as a custom link – and than put in navigation-label html code like:
<img src="url-to-logo.png" alt="Logo" />

for resposive case you must set this “menu-logo” to display none – and reactivate the av-logo-container.

The shrinking option is much more complicate. If you like to know it exactly – please open a new topic.
Tomorrow i have more time to explain it.