Windows 10: "Make text larger" problematic after all these years?

I recently revisited Settings/Make text larger MTL using updated Win. 10 while trying to assist someone with declining vision; I reported that it worked well - he thought it wouldn’t work properly and I stated that that was a view I’d formed also but apparently with updates over the years it was now usable. I increased the size again and noted that any drafting of a comment in Facebook led to the cursor going outside the comment area - I think whenever I pressed the space bar; turning off the MTL fixed this. The issue seems clearly related but may only apply beyond a certain level of tex

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Larger text

There is no way too make the text larger in the current version Adam

 

text larger

How can I make text larger only? I have tried to follow the instructions below:

Change the size of text in Windows 10. ... In Windows: Select the Start button, then select Settings > Ease of Access > Display. To
make just the text on your screen larger, adjust the slider under
Make text bigger

But when I open the Display window the first thing up is: Make Everything Bigger, and the slider bar is not there any where on the Display window. Only to make all apps and text bigger is showing.

 

E50 larger text

I have just purchased an E50 to replace my 6230, however whilst the screen is larger the text is smaller. Can anyone advise how to increase the text size?