Zephyr update a few months ago makes it difficult to resize columns or windows by dragging. Even when you can, it about 80% of the time winds up contracting the page instead of expanding. It was an incredibly stupid update that needs to be reverted yesterday. I would never choose to use this software if I were paying for it myself.
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You could always try and roll back to a previous version of the app by following the steps outlined in this troubleshooting guide, Downgrading an Add-on to an Earlier Version.
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