Depreciating a mobile phone as a secondary occupation

Is it possible to adjust the percentages of your depreciations in Dexxter?

I bought a mobile phone in the 2022 financial year and, according to my previous accountant, this cost was considered an “investment mobile phone” of €1097.65 – Mobile phone (purchase 28/07/2022, 3Y, 25% professional use)

Since I only bought it in the middle of the year, she used this calculation=1/3/4/12*5 = 3.47% -> €38.11

If I now want to enter this as depreciation in Dexxer, the figures are actually much higher. Can anyone help me here? Or give me some advice?

Thanks in advance!