Hi! I am Justin. Please give me a few minutes to go over your question.
Right click or option click on the dock. There will be a menu that pops up. Click “Turn Hiding Off”. All is well. Cheers!
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This is another way to get to the dock preferences if you aren’t getting a menu.https://support.apple.com/kb/PH25261To open these preferences, choose Apple menu > System Preferences, then click Dock.