The "Abc" column is waiting for a measure, but looks like you don't have one. A trick is to change the mark type to polygon and that will go away. But I'm not really sure that resolves your issue. Any chance you could share a packaged workbook?
Here is a good blog on getting rid of ABC written by Chuck Hooper who is a Tableau Zen Master
You can modify the space between and after dimensions by hovering and using the horizonal line with arrows to change the spacing this can make your dimension column bigger and when you do "fit width" on the dashboard your measure columns will be automatically made smaller.
This doesn't address your particular problem but here is a good blog on dashboard spacing (applicable to 10.4 and above )
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Thanks for responding so quickly. Unfortunately, I can't as my data is all proprietary information.
I think the next time I start a project, I am going to create a "dummy" worksheet that represents what I am doing in the real world I can share when I have issues.
That said, I was working on my current issue and found this blog post from Ryan Sleeper: http://https://www.evolytics.com/blog/tableau-hack-conditionally-format-individual-rows-columns/
I really like Ryan's work and have been following him for while. What I did was create a calculated field called "placeholder" and my calculation is MIN(0). I placed this on rows as a continuous field. Changed my marks to a filled circle and placed hierarchy information in the tool tips. So this now makes the wasted space, useable space and now when you hover over the marks, the tool tips now show the data.
Here's the beauty of this configuration is that now I can contain just a small part of the viz which makes it more compact than I was originally expecting!
Thanks for your reply and the resources. I did see a blog post about creating a blank field but was not able to get that to work nor did I see the arrow to the right of the column to be able to collapse that part of the view.
Again I really appreciate your advice as blogs are a really powerful resource.
You can try something like this,
When you hover your mouse on column divider then this symbol "<-->" will appear, click and drag this to right till the width of your worksheet. It'll cover up the entire empty space. This option you can use to set the width of columns in your view.
Let us know if this help.