Changing size of texts doesn't change to the chosen sizes

Expected behavior

Text sizes should be changed from the available options of medium, large, small and this should reflect in the size of the texts

Actual behavior

I changed the text size from medium => Large => small, there was no perceived difference in the text sizes

How to reproduce

• Download stocks widget from Fdroid here

• Run the app

• Use the settings on the application to change the text size from the default medium to either large or small, there won't be changes or effects of this settings on the text size of the app

• Browser: Stocks widget version 2.5.02
• Operating system: Android 7.0

Recording Of The Bug