Unreadably small plot axis labels on Dell XPS-15 laptop running Windows 10

**Problem Description**
When running a Chaco-based GUI application on my Dell XPS-15 Wiindows10 laptop, I'm getting unreadably small plot axis labels.

**Reproduction Steps:**

Run a Chaco-based GUI app. on a Dell XPS-15 running Windows 10.

```python
# Code to reproduce issue here
```

**Expected behavior:**

The same application run on a MacBook or under Linux produces acceptably sized plot axis labels.

**OS, Python version:** [Enter OS name and Python version]

Windows 10
Python 3.8