As Juve shows, you can get Mtext exploded from the MText menu and use EGAF for the selection. Add in Mask here if you want to say only explode yellow Mtext.
Because Mtext supports multiple fonts within a single MText block it can be a little tricky to use Datacad's change tools on them. For example if you use multiple TTF or SHX fonts within a Mtext block, odds are that using the Change, Text, Font command won't work. If your Mtext entity doesn't have any custom formatting and is all a single font, it should be able to use the normal Change, Text, Font dialog and then use EGAF for selection to change their fonts.
If a seemingly simple MText entity wont change it's font using this method it probably has some left over junk formatting in it hangin things up. You can check the Mtext Properties dialog and click the
Format RTF... button to open the RTF (Rich Text Formatting) dialog. If you see some junk text that looks similar to this
at the very front, very end (or sometimes it can even be in the middle of the text) it's likely this is hanging things up. You can remove the junk text from the and then using the Datacad change tools should work from there on out, or until you import something from a external source like word or copy and paste from another Mtext block with different formatting. Be aware that removing the junk text from the RTF dialog may adjust some formatting like spacing of your existing Mtext, so make sure you check your Mtext alignment afterwards with things like list numbering if your in a working drawing. If you make sure your base files and symbols' Mtext blocks are clean from the start then you can happily use the Datacad Change tools on simple Mtext blocks.
Not sure about using aspect ratios with Mtext as I never have tried, but I don't think it's supported.
The 'Factor' in the MText dialog should be updated to Line Spacing I believe to match the updated dialog box labeling in the other entity properties dialog boxes. It's not really used for the Mtext but it is a property of the entity that could be used when using Identify, Match or Set All for other entities that can properly use Line Spacing.
Similarly, dialogs should probably start getting some section dividers dividing the dialogs into sections of settings like Mtext settings & Boundary settings. Or each option should be uniquely labeled. Line Type, Line Spacing, Pen Style etc. at the bottom of the dialog for the Boundary box should probably be re-labeled Boundary Line Type, Boundary Line Spacing, Boundary Pen Style and so on to avoid confusion. Box Color should also be changed to Boundary Color I would think. Just more consistent labeling across everything.