Hello @haresh96011,
Thank you for your query and we are so sorry about the trouble this must have caused.
Please head over to your WordPress Dashboard > Rank Math > Titles & Meta > Pages and make sure you have removed the variable “%sep%” in the “Single Page Title” field. See the screenshot for your reference: https://i.rankmath.com/i/BWeSOS
However, please note that by removing that variable there, it will also affect the rest of your page so if you intend to only remove the separator from your homepage, you need to do that instead on your homepage editor. Please refer to this guide: https://rankmath.com/kb/homepage-meta-title-and-description/
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.