I am using URP rather than built in renderer (as well as a much newer version of Unity) and having some issues with particle effects.
The general problem seems to be one of transparency. For example
I have a similar problem with my arrow trails:
I have spent a lot of time fiddling with shaders and materials for my trail to get to where it is now (it was previously very dark).
I am just wondering where I need to look to get a more solid particle effect than I am getting? Alpha in “Start Color” is all the way up.
Any help appreciated