The Louis answer:

Close Quickbooks

Open this folder

C:\Program Files (x86)\Intuit\QuickBooks 2021\Components\Services\Images

Make a folder and call it DH       

(I did this because it is related to Discovery Hub)

Move all pictures with the following names into that folder

DiscoveryHubNew_Hover100.png
DiscoveryHubNew_Hover125.png
DiscoveryHubNew_Hover150.png
DiscoveryHubNew_Hover200.png
DiscoveryHubNew_Hover250.png
DiscoveryHubNew_Hover300.png
DiscoveryHubNew_Normal.png
DiscoveryHubNew_Normal100.png
DiscoveryHubNew_Normal125.png
DiscoveryHubNew_Normal150.png
DiscoveryHubNew_Normal200.png
DiscoveryHubNew_Normal250.png
DiscoveryHubNew_Normal300.png
DiscoveryHub_Hover.png
DiscoveryHub_Hover100.png
DiscoveryHub_Hover125.png
DiscoveryHub_Hover150.png
DiscoveryHub_Hover200.png
DiscoveryHub_Hover250.png
DiscoveryHub_Normal.png
DiscoveryHub_Normal100.png
DiscoveryHub_Normal125.png
DiscoveryHub_Normal150.png
DiscoveryHub_Normal200.png
DiscoveryHub_Normal250.png

Open Quickbooks

Voila

It may not stop the Discovery Hub but at least I don't have to look at it anymore

Put the files back if it breaks anything

Don't delete the files just in case