Different font style in different Text box in same slide

When I change font style in a text box used in impress slide, style of all other text boxes used in same slide is also changed. But I want to change the style of the particular text box which I have selected. Can someone please help me with this ?

Libre Office - Impress
Build ID: 1:6.4.4-0ubuntu0.20.04.1
CPU threads: 4; OS: Linux 5.4; UI render: default; VCL: kf5;
Locale: en-IN (en_IN); UI-Language: en-US
Calc: threaded


I wonder why this never got an answer. I’d like to do the same.