Tiny icon in MacBook Pro dock

I restarted the Dock and that fixed the issue.

Go to terminal and run

killall Dock

Source: https://macpaw.com/how-to/dock-frozen-unresponsive

kombij wrote:

There's a tiny red icon in my dock, not attached to any open app, nothing happens when I hover over it, I can't move it and it won’t go away.

https://discussions.apple.com/content/attachment/7c87a220-4841-4056-afb3-550cd50f1776

it falls in a specific location— note:

Command Tab presents the HUD (Heads up Display) for running apps, see if you can figure something out there.

No insight, try shutting down with no running application and restart if in doubt.

ref: Open recently used items on Mac - Apple Support

verify your software is up to date…

The current stable release of Ventura including bug fixes, security updates is macOS Ventura 13.5

Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support

Something else looks OFF - where is the Download Folder that is Normally just inside or left of Trash ( Bin )

image below

Try the Terminal command below. Suggest you copy and paste into Terminal and hit the Return key

 killall Dock 

There was a lot of Dock customization shown in the OP's post. As an example, missing apps that are standard installs (in addition to the Download folder mentioned above):

Siri

Safari

Mail

Music

Contacts

Calendar

Reminders

Maps

Hello kombij,

Open the Activity Monitor app (in the Applications > Utilities folder), Click the CPU column to reorder it by "Process Name". Select the Dock application and click the "X" icon:

Yes , those mentioned in your above can be removed.

Though as also mentioned, customization of the dock does have limits.

Downloads folder in the Disk normally would Fall in that limitations IMHO

Let me correct myself. Yes it can be removed but do not see a specific value in that. Personally that it