re: For example, I want to line up the search and the other buttons, move down the message, etc.
Most of the functions that output header objects can be found in this files:
They are added by WP actions, to control the order, you could remove the actions (by using an action) and then re-add the actions in the order you want the objects. Here the line in the file where the actions are setup:
Two objects, the category drop down and the search input are also actions, but they are added by the template. YOu can find them in the
tile-plus.php file in this folder:
After moving objects around, you’ll likely have to adjust the CSS to deal with alignment and such.
Hope that helps!