THIS IS A DATAPACK! You need to either add it to your world's datapack folder or use an automatic loader such as OpenLoader or Paxi.
This simple datapack removes the Scarecrows from some structure mods, these are low effort features that spawn every 2 chunks, making them EXTREMELY common, and well, annoying.
How to install?
Download the zip and put it in your world's datapacks folder.
Alternatively, install openloader or paxi, and put the datapack inside their data folder.