I have a formula in LO which is too long to fit on one line. If I break it along the sum of two different components everything looks fine

```
f(x) = g( x ) newline + h( x )
```

the + h(x) is centered on the line below. However if I break along the product of two components or another operator in the same way

```
f(x) = g( x ) newline * h( x )
```

I get a red question mark in front of the h(x) and no *. If instead write

```
f(x) = g( x ) newline %* h( x )
```

everything shows up correctly but the second line is left-aligned rather than centered. How do I split up formulas like this and keep things centered?