did you try holding down the control button and rolling the mouse wheel forward? also hold down control/shift and click +
I don't know if this applies to the Forum, but it may be of use for other sites (from https://support.apple.com/en-us/HT202828): You can change the size of your font in Mail, Contacts, Calendar, Phone, Notes, and other apps that support Dynamic Type. Change the font size Go to Settings > Display & Brightness, then select Text Size. Drag the slider to select the font size you want. Make the font even bigger Go to Settings > Accessibility, then select Display & Text Size. Tap Larger Text for larger font options. Drag the slider to select the font size you want. Making the text too large might make it hard to tap buttons or other functions within apps. Go back to your settings and adjust the font size as needed.
