invisibility using mask component on scrollable list

i ran into a problem while trying to implement a scrollable list into my 2D game. since im new to unity i used a video giude on helping me to achieve my goal of having a scrollable list. (heres the video;

) tho once i applied the mask option to the list (panel) my grid (image) turned invisible hiding both itself and the buttons on it. i looked around for a fix but couldnt find one yet, tho there was a comment from "Creations Maxo" saying the following; "A special note : The mask component will only work if there's an actual image component with a image that isn't 100% transparent. For example, using an empty sprite as the source Image will make the mask's content invisible. The solution is simply to use the default unity sprite image and turn its Alpha channel to 1 manually. Since it's considered a not invisible, the mask will fully works (there's no alpha values in the mask. Only 0 or 1) and the background image will be have a transparency of 99.67%... meaning invisible mostly." and the problem about that is; im a dumdum and dunno where the alpha channel option is ._. thank you for your time and potential replies

 

Hi.
This forum is for the new UIElements system, your question is about uGUI so try the uGUI forum:
https://forum.unity.com/forums/unity-ui-ugui-textmesh-pro.60/

 

wow the same thing happened twice, im sorry for posting in the wrong section. i fixed the issue ive had by the way, but got no clue how to delete this post

 

No idea either. Don't worry about it.