Giving space in formula to center in the middle

I have inserted a formula (Insert->Object->Formula) and now in the denominator, i want to center it to the middle in between the average symbol.

Here is the formula i have:

C_x(t)=left langle {%SIGMA h_{ij}(t_0)h_{ij}(t_0+t)} over {%SIGMA h_{ij}(t_0)^2} right rangle

I am getting as in left side but i want it as in right side (screenshot images attached).
getting
expected

How can i solve this issue?

Thank you.

What version of LibreOffice do you use? I just copy/paste your formula in to Math and I have formula that looks as your formula right

I’m using LibreOffice 6.1.0.1

I am using LibreOffice version 6.0.5.2.

I have found the answer:

Here is the formula:

C_x(t)=left langle {%SIGMA h_{ij}(t_0)h_{ij}(t_0+t)} over {alignc %SIGMA h_{ij}(t_0)^2} right rangle

alignc will align the things to center.
This will now be the formula in Math which looks as in the right side in my question posted.

please check option in dialogue (in formula editor) Format->Align. I have variant Center