The window sizing need to be stored in session file. Ensure that you have autosave on or help save the session right before closing. I found "type-of-mitigation" to this problem for now - just untick "continue to keep password" area in advance of quitting Winbox. By doing this (without the https://winbox-download28383.wssblogs.com/31861537/the-smart-trick-of-winbox8my-com-that-no-one-is-discussing