The issue with the colors is that you've selected a non-default theme "Deep Grey" where the active object is yellow but non-active selected objects are blue. To change this back, select Edit → Preferences... from the menu, select the "Themes" panel from the list on the left, and at the top of that panel, click on the "Deep Grey" preset and change it back to "Blender Dark".
It looks like you already figured out how to get rid of the axis annotation by unchecking the "Affect Only → Origins" option, as @JohnEason had suggested.
The remaining problem is that, when multiple objects are selected, switching the viewport display from wireframe back to textured only affects the active object by default, not all selected objects, but you can change this behavior by holding down the Alt key at just the right time.
So, select all the objects in your truck that you want to change back to solid objects, open the "Object Properties" panel in the properties pane, open up the "Viewport Display", and while holding Alt, click the "Wire" selecting in the "Display As" dropdown and change it to "Textured" (the normal default). That should fix the issue.
Technically, as long as you're holding Alt either when you click on "Wire" to change it or when you select "Textured", all selected objects will be affected by the change, but you can just hold down Alt the whole time to be safe.
