Header (navigation?) errors

Don’t know..just activated GD…
You can try to play with it and see if errors come up

Have you tried switching theme? That’s maybe why you lost the widgets.

That is strange. Going here yourdomain/wp-admin/admin.php?page=geodirectory&tab=geodir_manage_custom_posts&action=cp_addedit&posttype=gd_place and changing the label name, it should reflect your new string.

Ok, i think you can’t change this because you don’t have the custom post type addon .
You can change it by translating the strings in the .po file.
It will change all the occurs of “Place” in the website, but it does not change the slug, you can change it from the Permalinks settings.

You can find the documentation for the translation/editing here.

You can skip the step nr 5 if you’re using WordPress 4.+

The translation-thing it’s easiest than it seems, also, it will be preserved and you will not loose ay modification when a new update will be released.

CSS depends on your theme,
for example, I would add

.geodir-sidebar-wrap {
margin-right:20px; 
}

and

#geodir-wrapper-content
{
margin-left:20px;
}

this will create a margin from both sides in the detail page.

You might also need to change the % of width in the page, by adding, for example, width:60%; in the #geodir-wrapper-content .

This modifications need to be added in your style.css inside your theme folder, better if you have a child theme, so this will be preserved even when your theme will be updated.

Hello, this is most likely a field set in Geodirectory / Design and then on the Navigation tab.
It could be “Show listing link in listing navigation”.