www.wysiwygwebbuilder.com

Is there a way to set the z-index on the Dropdown Menu ?

The z-index is determined by the position in the Object Manager.
https://wysiwygwebbuilder.com/object_manager.html

You can use the arrange tools to move objects up and down in the z-order.

If you go to https://cvitp.ca/ontario.php

you will see that when you select Special forms the menu is behind the flag. I did try to select the menu to move to front and move forward but that doesn't correct the problem.
The image is attached to a custom css but changing the z-index on the image doesn't change it either.
Kinda lost on that one.

If you go to https://cvitp.ca/ontario.php

The link doesn't work...

if using custom css then you should ensure it is valid/correct and does not conflict with other code in the software as in general there is no help with custom code.

Yes it does, just not on mobile

The menu looks to be on a layer. Simply select the layer and move it all the way to the front by using the arrange tools. This will ensure that the header and menu are the highest z-index.

That didn't work either so i assigned a custom style to the layer and it works now