EDIT 2: Seems “Text scaling factor” (a setting in Linux Mint) is the culprit. When it’s 1.3 and above, the Max button disappears and follows behavior in my OP below.
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EDIT 1: Probably worth mentioning that this happened after a set of OS updates.
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Hello. Only the Minimize and Close buttons are visible, at the upper-right corner, on the first file I open. Succeeding opened files show all 3 buttons (including Maximize). Cycle repeats whenever LO closes/exits. Thank you.