You can create your own themes so as to use the layout you like in the OTRS web frontend. To create own themes, you should customize the output templates to your needs.
As an example, perform the following steps to create a new theme called "Company":
Create a directory called
Kernel/Output/HTML/Templates/Company and copy all files that you like to change, from
Kernel/Output/HTML/Templates/Standard into the new folder.
Only copy over the files you actually change. OTRS will automatically get the missing files from the Standard theme. This will make upgrading at a later stage much easier.
Customize the files in the directory
Kernel/Output/HTML/Templates/Company, and change the layout to your needs.
To activate the new theme, add them in SysConfig under Frontend::Themes.
Now the new theme should be usable. You can select it via your personal preferences page.
Do not change the theme files shipped with OTRS, since these changes will be lost after an update. Create your own themes only by performing the steps described above.