there is no options for paragraph field's manage display.

On your screenshot I do not see which type of field is that. Swiper will work on multiple Image fields or multiple Text fields or Media entities or Paragraphs (swiping each paragraph instance as a slide). I think you are looking for the wrong field or the wrong way to implement.

Sorry that my screenshot was not clear enough to see the type. It is a Media field. First, i created the paragraph type and added that field as Media reference and wanted to use with swiper formatter but i couldn't see the formatter in the manage display. Normal fields are working even main paragraph got option to choose swiper formatter but not the individual field inside paragraph's field.

I see. Obviously Swiper works on fields with multiple instances so at the moment I can only assume that you might have "Allowed number of values" set to 1?

right! it is the problem with the limited field. thanks heap!