Hi @lubos
Manager.io is an amazing open source software but i cannot see the download button anywhere i’ve searched on github but nothing shown, please i request the access of this amazing software i want to improve and modify the user interface !
Cheers 
Manager is not open source software. Just because the desktop edition is free does not make the software open source.
Right is there an option to change the layout of the software “user interface” ??
Basically, no. You can add and customize to some extent through Settings, but you cannot modify the basic interface.
I see Thanks @Tut
one more question please :
How do i know my account credentials for the localhost page ??
Cheers
You can put in a feature request for what exactly you would like to improve and the developer will consider.it.