How to Configure..., Font Size and Other Details

Hi !
I have some questions, for which I did not Find answer in the FAQ or Forum.
1 - How to NOT Show Hiden or System Files ?
2 - How To Change the FONT SIZE of the Letter of the Directory Opus ?
3 - When I Add a Tab, how to make it goes to "Computer", instead of an empty tab or Standard Tab ?

I'd appreciate your help .

Thanks

1.Preferences / Folders / Folder Display / Hide hidden files and Hide protected operating system files
2. Preferences / Display / Colors and Fonts
3. It depends how you are adding the tab?