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Let's assume you have simulated a standard particle fluid scene (all particle types are only this type is supported) and detected some particles you want to remove:
Selected particles are displayed in green.
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- Stop the simulation and go to the frame where the misbehaving particles appear.
- Select the emitter.
- Open “Particle Selection” - a green frame appears around the viewport.
- Draw a rectangle around the region of interest – selected particles are displayed in green (see first image above).
- If you want to add particles to the current selection use the Shift key.
- Particles are deselected with the Ctrl/Cmd key.
- Click on “Add Group” to store the selection. A new group is created under “Selection”.
Now the particles are stored temporarily and can be deleted with “Remove particles”, but there is one important step left:
- Right-click on the emitter in the → “Nodes” “Nodes” panel.
- From the context menu choose Export > Export now... to save the new state.
- Resume the simulation from the current frame.