The tiny price/y axis labels on my charts seemed to be causing me a lot of eye strain, especially on my 4k monitor. But I just learned you can customize the fonts on your charts by modifying the workplace.xml file your using! Each chart & tab has it's own font setting specified in the XML, look for these <ChartControlProperties> and <LabelFont> tags and bump that size up from a microscopic 11 to a middle aged friendly 14:
<NinjaTrader>
<NTWindows>
<Chart-f6757cb0c5584431880f87fb3ac5d90b> <TabControl>
<Tab-8b9bdcceea0f41e992ccbc2dafec4990>
<Properties>
<ChartControlProperties xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<LabelFont>
<Bold>false</Bold>
<FamilySerialize>Arial</FamilySerialize>
<Italic>false</Italic>
<Size>14</Size>
</LabelFont>
Inspired by the idea from user cls71 in this post where he discusses changing some other fonts, which I found super helpful:

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