If you are facing issues with Advance Search form layout on homepage after update and the form is much wider and not looking great (as shown in the picture below) then it is nothing to worry.
It is showing like this because you have manually added the Advance Search form in Home Search Area widget which is adding another CSS class into the div of Advance Search form. Well, let’s not get into the technical side. Please navigate to Dashboard > Appearance > Widgets and remove the Advance Search form from Home Search Area widget as shown in the picture below.
Once you have deleted the widget the layout of Advance Search form will be shown like before. If you face any issue which you don’t find in our Knowledgebase then please feel free to open a new thread in support forum.