Hello all!
The version is 2020.1.6f1. Build-in RP.
There is no field for assigning trail material.
@richardkettlewell , please help!
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Hey this seems like a bug 
I’ve just had a look at it and it seems like, if you Press “Restart” in the Scene View particle playback GUI, it will make the setting appear.
We will get a proper fix out ASAP.
Please let me know if this workaround works for you.
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@richardkettlewell It worked, thank you!
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You can follow the progress of the fix here: Unity Issue Tracker - [Particles] Can't set Trail Material via Inspector
(It might take a few hours for the link to work - I only just made the bug)
We have a fix that we are testing at the moment.
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Hi, just to add to this, it seems that I cannot see the trail material field if I am viewing the particle system from a prefab in the project tab. If I open the prefab, the field appears. Not sure if this is a different issue.
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Please report a bug for this
Bug reported.
CASE IN-5208
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This is not fixed yet. But the work-around did work for me.
This issue happens too if the game object is deactivated.
make sure trail is selected in particle system to show trail material option.