In the DesktopUI I have the configuration files with this parameters.
tools: ['transform', 'adjustments', 'text', 'overlay', 'filter']
controlsOrder: [['adjustments', 'filter', 'overlay'], ['transform', 'text']]
And as a default the filter tab shows up when I create the editor.
Is there any way to set the adjustments tab as a default at startup?
It's not documented, as we don't support transform as the initial control, but you could try setting options.editor.defaultControl to adjustments.