Font, Font Sizes & Menu Arrows

**Is your feature request related to a problem? Please describe.**
1. Font is too small in some places like smartai editor. (See Fig 1)
2. Many menus have a down arrow on them suggesting that there are more options of you scroll lower. There are no additional options. (See Fig 3)

**Describe the solution you'd like**
1. Please consider allowing default scaling to scale past 1 (maybe to 2 or 3?) I understand I can also scale the entire UI, ( and scripts themselves, See Fig 2) but I have to scale the UI to 250% just for the smart AI section and you can imagine how that makes everything else look.
2. Please consider removing there arrows where they arnt needed. They uglify an otherwise **beautiful** UI!

**Additional context**
It might be nice to just add a section to replace diff parts of the UIs fonts themselves too with a size slider for each (there are maybe 3 major sections, editing, lists and icon names?)

Thanks for the program, its gorgeous and functional.

[Fig 1](https://i.imgur.com/Y2BXOBJ.png)

[Fig 2](https://i.imgur.com/XCJdBFR.png)

[Fig 3](https://i.imgur.com/YqEUbOJ.png)

Start by reproducing the font-size and menu-arrow examples shown in Fig 1 and Fig 3, then inspect the Avalonia UI areas involved in the SmartAI editor, general UI scaling, and menus. Define the scope before coding: done should specify which font controls are adjustable and which arrows are removed without hiding real options, with the screenshots' cases verified.

Written by the indexing model from the issue text.