Because this is just the shell, the kernel is ProType Titler. You need to go there to customize.

 
There is no settings in ProType Titler to change that yellow color. This yellow color is NOT "a shadow" what you can see. Try the same setting. You will see, you are unable to do that.
@lan-mLMC

As the longtime Vegas user you pretend to be, it's obvious that you missed a lot. You're in Title&Text and not in Protype Titler.

@Yelandkeil "ignore is the best medicine".... Not necessarily, can't keep ignore all the while. We have to address them when they are becoming toxic.

@Yelandkeil Thanks, I know we can do that in that way but we shouldn't. There should be an option to set that simple setting lik "color of shadow".

As the longtime Vegas user you pretend to be, it's obvious that you missed a lot. You're in Title&Text and not in Protype Titler.

@3POINT This is a preset for quick use in "Insert Text" menu.
What a point to telling me about Protype Titler? It's a seperate thing. I don't want to create anything there.
I just isert "text" and set "animation: rolling glow and enlarge".
Seriously, don't you thinkt that option for this color available to change should be in menu showed on screenshots?

You don't seem to understand something. I created a text and selected an effect from the shortcut menu. This effect is yellow in color. So I want to change this color in the menu I see. And it can't be done.

And you're telling me to redesign the entire inscription somewhere else. This probably doesn't have much to do with the specific problem I described.

Where do you see option to change a yellow color? Even there?

Look it is ProType Titler


 

Currently, I can't even play with the options because the program has obviously crashed. I haven't liked ProType Titler for as long as I can remember.

The sad thing is that nothing has changed in the stability of this program for so many years. This situation should not happen. White blank page on the left is of course error.
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@Vegas21_user This is a simple screen recording of how to modify character-level properties in ProType Titler.

As the longtime Vegas user you pretend to be, it's obvious that you missed a lot. You're in Title&Text and not in Protype Titler.

@3POINT This is a preset for quick use in "Insert Text" menu.
What a point to telling me about Protype Titler? It's a seperate thing. I don't want to create anything there.
I just isert "text" and set "animation: rolling glow and enlarge".
Seriously, don't you thinkt that option for this color available to change should be in menu showed on screenshots?

You don't seem to understand something. I created a text and selected an effect from the shortcut menu. This effect is yellow in color. So I want to change this color in the menu I see. And it can't be done.

@Vegas21_user You don't seem to understand that the quick presets in Title&Text are originally created in Protype Titler. In Title&Text you cannot change the animation parameters used in Protype Titler to create the animation and fx, therefore you have to return to the Protype Titler. How this can be done is shown by @lan-mLMC

@Vegas21_user as a longtime Vegas user, it seems you still have to learn a lot...

@3POINT "as a longtime Vegas user, it seems you still have to learn a lot..."
^ Because I tried using ProTypeTitler and found it to be an inconvenient tool. That's why I learned how to create subtitle animations in a more advanced program like Adobe After Effects. I created whatever I wanted in it and imported it to Vegas later. Everything looked much better and gave me more creative freedom. More possibilities. There is a lot things like that. I want to do a greenscreen keying? In After Effects with plug-ins I will get way better results. So I even didn't want to do vfx things in Vegas many times. Even if Vegas still has "chroma keying" feature or something similar. It's a my choice. My better choice.