Delete chunks which contain no player entities, configurable chunk radius & paving detection
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.
using the delete empty chuncks somehow the biters also get placed back to the places i have cleared but that i dont have any items/elements/paving on, is it suppose to be like this ?
Yes, those areas are getting deleted. When those areas regenerate anything that was there regenerates as well.
oh no... my borders are secured.. but within my factorio castle walls have biters... now.. okie thought it will just remove the chunks
It does just remove the chunks. The game regenerates them as needed as if you are just exploring for the first time.
Depending on the radius setting in MOD settings, you would just need to place a single tile of stone or concrete to hold an area.