How about using one Deck a scheduling algorithm or all Decks one scheduling algorithm?

How about using one Deck a scheduling algorithm or all Decks one scheduling algorithm?

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If you choose the FSRS algorithm, it applies to all decks in your collection.

Are you talking about the parameters/presets?

Thanks. I use FSRS algorithm.
However, some materials are difficult, some are easy, the parameters are not suitable for all of these situations.

Yes.
The optimization process are not applicable for all situations.
Some materials are difficult, and some are easy.

You can assign your decks to different Preset groups, and have different parameters and desired retention. Deck Options - Anki Manual

Thanks for you detailed explanation.