Always good to know.
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/canadian-citizenship/admininistration/general-file-processing/procedure-withdrawal-applications.html
Withdrawal policy
The Citizenship Act does not specifically address the withdrawal of citizenship applications. The Immigration, Refugees and Citizenship Canada (IRCC) policy is to permit applicants to withdraw their applications. In the event that a misrepresentation investigation is underway, IRCC may deny an applicant’s request to withdraw their application or hold it in abeyance until a formal decision has been made on their application, so as to not undermine the Act (see the “Misrepresentation cases” section below).
The option to withdraw an application exists in the following circumstances:
the applicant informs the citizenship office that they will not be available to pursue their application and will continue to be unavailable for the foreseeable future (for example, for the next six months or longer)
the applicant has changed their mind about becoming a Canadian citizen (for example, the applicant has just realized that they will lose their current citizenship, or they no longer wish to give up their current citizenship)
the applicant feels they may no longer be able to meet the requirements of the Act