Users can customize the graphical appearance of the parameters in Start Workflow window in Portal, by checking the Enable Custom GUI option and click on Custom GUI button (Custom GUI does not apply for Resume window for workflows with approval/wait for more user input). The Custom GUI Parameters window opens and users have the possibility to arrange/reorder/resize columns (changes will only be visible in Start Task window in Portal, when the workflow is launched for execution):

Administrator → Overview → Edit Parameters → Custom GUI Parameters window:

Portal → Workflows → Start Workflow window:

To cancel the custom GUI for a workflow, uncheck the Enable Custom GUI checkbox and confirm the action by clicking on Yes button:

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