With the change you are reporting here https://docs.unlayer.com/changelog/text-direction-control it is not possible to change the font size for selected text. This is only possible for the entire text block.
This is inconsistent considering that the inline text editor has many options that can affect the selected text but not the font size.
Do you have any plans to bring back font size in the inline text editor?
If not, could you provide some workarounds to get around this problem without using an HTML block? Operating only on text blocks in the context of different font sizes is difficult.