Thunderbird has become a monster!
Why do I have to right click on a message then click on open in new window then go to that window to see the message?
Thunderbird used to respond to a double click on a message then open it and immediately go to that message.
Now is it just simply a pain to read email.
Chosen solution
Is the mouse actually registering a double click ? Mouse does double click - data is received by computer - it understands a double click was requested and performs the action on the object in question which is Thunderbird message open email in window.
I'm on Windows 10 In bottom search type : mouse select 'Mouse settings' select 'Additional mouse options' There is a test. You double click on the folder icon to open/close the folder. You can adjust the speed of the double click to improve situation.
Do you have 'Click Lock' enabled - if yes, uncheck that checkbox and then retest in Thunderbird.
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You can tell Thunderbird to always open messages in a new message window.
At the top right of the Thunderbird window, click the menu button 
> Options - General - Reading & Display
Modified by christ1
Suggest it's a flaw in your system. double click works fine for me on two versions, 78.1.1 on Windows and 80.0b4 on Mac
Do you have any idea what to look for in my system? I have had the same suspicion for some time now.
Chosen Solution
Is the mouse actually registering a double click ? Mouse does double click - data is received by computer - it understands a double click was requested and performs the action on the object in question which is Thunderbird message open email in window.
I'm on Windows 10 In bottom search type : mouse select 'Mouse settings' select 'Additional mouse options' There is a test. You double click on the folder icon to open/close the folder. You can adjust the speed of the double click to improve situation.
Do you have 'Click Lock' enabled - if yes, uncheck that checkbox and then retest in Thunderbird.