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Due to COVID-19, CRA introduced simplified forms T777-s and T2200-s to claim the home office expenses only. To claim the expenses, fill out the new T777s-"Statement of Employment Expenses for Working at Home Due to Covid-19" in 2020. You can use one of the two methods: Temporary flat rate method and Detailed method.
More information can be found at the TurboTax links:
Work from home expenses due to Covid 19
Where do I claim my employment expenses in the online edition of TurboTax?
Where do I claim my employment expenses in the CD/download edition of TurboTax?