Crop away distracting surroundings before background removal while keeping enough room around the subject and its important details.
Decide what must remain
A crop defines which part of the photograph enters the workflow. Before cutting anything away, identify the full subject, accessories and any meaningful contact points. Leave space around hair, ears, handles or straps. If the source already cuts off part of an object, background removal cannot recover the missing material.
ToolNivo currently has no crop editor. Prepare a copy in an image editor first, then select that supported file in the remover. Keep the uncropped original for later changes.
Give the subject enough of the frame
A tiny product in the middle of a large room occupies little of the model's working image. A tighter crop makes the relevant subject occupy more of that representation. This can help clarify the task, though it does not guarantee a precise mask. Avoid cropping so tightly that the subject touches every edge; some surrounding context still helps you judge the result.
For example, crop a single plant and its pot from a photograph of a whole shelf. Keep all the leaves you need, including the small ones pointing sideways. Do not include a neighboring plant unless you want both in the cutout.
Review after processing
Compare the output against the prepared copy rather than against memory. Check that the crop did not remove the very detail you expected the model to preserve. If several similar objects still compete for attention, try a composition that isolates the intended item more clearly. A crop is a way to simplify the input, not a promise that the tool can choose whichever object you have in mind.