A quick look at the default assets available from the Game Templates in UE5 that may help you in Level Design and blocking out your maps.
00:00 - Prototyping Intro
00:19 - Default Assets Overview
01:31 - Prototype Meshes
02:49 - Materials and Material Instances
05:10 - Solid Color MI Settings
05:58 - Grid MI Settings
07:12 - Grid Top Surface Color
08:46 - World Algin vs Object Align
10:00 - Blockouts and ZFighting
12:02 - Blockouts vs Modeling
14:05 - MI Colors for Gameplay
17:13 - Exporting Blockouts
18:42 - Conclusion