M-Files Desktop UI color schemes, backgrounds and icons are typically modified with easy-to-use "Theme Editor" application available for free here: https://catalog.m-files.com/shop/theme-editor/. It looks like these elements cannot currently be modified with it, however, but there is an improvement suggestion ID 151926 that they should be, so hopefully this will be included in a future version of Theme Editor or UI refresh.
Note that if you make changes to .css files within installation directory, the changes are likely not to survive a version update.
Shellframe references can be found here: https://www.m-files.com/UI_Extensibility_Framework/#MFClientScript~IShellFrame.html
M-Files Desktop UI color schemes, backgrounds and icons are typically modified with easy-to-use "Theme Editor" application available for free here: https://catalog.m-files.com/shop/theme-editor/. It looks like these elements cannot currently be modified with it, however, but there is an improvement suggestion ID 151926 that they should be, so hopefully this will be included in a future version of Theme Editor or UI refresh.
Note that if you make changes to .css files within installation directory, the changes are likely not to survive a version update.
Shellframe references can be found here: https://www.m-files.com/UI_Extensibility_Framework/#MFClientScript~IShellFrame.html