Configuring OFBiz Working Time Settings

I am setting up a calendar in the Work Effort application where I need to limit the number of fields displayed when a new event is added (event type is EVENT). I changed the EditWorkEffort form in WorkEffortForms.xml to ignore fields I don't want to display. I am using the use-when attribute to check if the context keys workeffort, workEffortId is null and workEffortTypeId is EVENT. If the above conditions return true, then I ignore this field with an ignored tag. Otherwise, the fields are displayed as they were before a new workeffort was created for a new task (event type - TASK) or when a new work is created (event type - AVAILABLE).

Now the above logic gives me the desired result in case of a new event (event type is event). But when I add a new task (event type - Task) or new work effort (event type - Available), all the fields of the WorkEffort object are displayed (this is correct), but the layout is distorted (this is my problem). When I checked the final generated html source I can see that colspan = 4 is added to the html td for the corresponding fields wherever I use the use - when the tag.

I hope I have explained my expression about the problem. I need to fix a layout issue. And also am I doing the right thing for my setup or is there a better way to do this?