Difficulty Zooming into Multi-Line Equations

[NV-Codes]

Version

MathCAT 0.7.5

Issue

Within multi-line equation blocks, I am unable to zoom into the elements of any particular line unless I use Ctrl + Shift + Down, which zooms in maximally. I am unable to easily zoom in by one level.

Example

$$\begin{aligned} \frac{dx}{dt} &= ax + by\ \frac{dy}{dt} &= cx + dy \end{aligned}$$