Not necessarily. The required quantity comes from the detergent and appliance instructions, not simply the available space. Filling a compartment to the brim can exceed the intended amount.
Understanding this situation
Load soiling, product type and programme may affect guidance. A measuring line has a purpose, and a tablet product may have its own restrictions rather than using the compartment volume.
A useful next step
Dose as directed and keep products dry and secure. If residue or foam appears, review the actual amount used before assuming weak washing. Do not add a second dose midway through a cycle to improve a result you cannot yet assess.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.