Is there any configuration to hide the Units column on the resourceassignments picker? If not, is there any other way to remove that (i.e.: through listeners)?
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Yes sure, please see docs for ResourceAssignmentColumn which has a AssignmentField as its editor: https://bryntum.com/docs/gantt/#Gantt/column/ResourceAssignmentColumn#config-editor
Using the editor config you can configure the https://bryntum.com/docs/gantt/#Gantt/widget/AssignmentField#config-picker (which is an AssignmentGrid)
And https://bryntum.com/docs/gantt/#Gantt/widget/AssignmentGrid has a https://bryntum.com/docs/gantt/#Gantt/widget/AssignmentGrid#config-unitsColumn config you can use to add:
{ hidden : true }