Re:Entity Outliner is a clientside mod that allows you to select entity types to outline, making them visible through obstructions like a entity xray / entity ESP / wallhack) at any distance (by using a glowing effect).
New : Forge and NeoForge mod versions (1.21.8+)
For players on older versions, the mod is now also available for Forge 1.20.1
For older fabric versions, Re:Entity Outliner is a continuation of adamviola's initial mod : https://www.curseforge.com/minecraft/mc-mods/entity-outliner
This mod will help with:






And many more!
Entity Selector

This screen allows outlining of any entity in the game. There's a search bar for narrowing down entities and buttons to organize the results by entity category, deselect all entities, and toggle on/off the outlines. Entities added by other mods do appear in the results.
For the technically inclined, the search works using a precomputed hashtable that maps a string prefix to a corresponding list of results. The lists of results are computed for all prefixes that correspond at least one entity type.
Controls for toggling the outlines and opening the selector

Custom keybinds are provided to open the entity selector and toggle the outline. The outline can also be toggled via a button inside the entity selector.
MIT. Feel free to use this mod in any modpack.