Just made a mess!any help please

I tried to change my theme and font size and then other things changed like my 3d window.I can’t view around my objects by holding in mmb and moving the mouse,the whole screen just moves sideways.how can i reset everything to the way it was when i first installed blender.any help please. :expressionless:

look in the blender foundation folder, the one blender installed into, for a file called “.B.blend” and delete it, or archive it or move it or whatever. just remove it from your blender directory. this will reset everything to default for the next time you open.