Many apps use the GTK 3 toolkit on both Windows and Linux. Once your favorite software gets updated to a version that uses GTK 3, you might find it confusing to enter a file or folder path manually. Unlike the GTK 2 dialogs, where there is a special button to enter the location text box, GTK 3 dialogs have no option to do this. Here is what you can do.
I faced this issue when my Firefox browser was compiled with the GTK 3 toolkit in Arch Linux. While the appearance was not significantly changed, the open file dialog and the save file dialog changed their look and feel. The button which enables the location text box was removed from the dialog. It always shows the location breadcrumb without an obvious way to type the location manually.
To fix this annoyance, you can use the good old Ctrl + L hotkey. In GTK 2 dialogs, it moves the focus to the location text box. In GTK 3 dialogs, it makes the location text box visible instead of the breadcrumbs bar.