Description:
Setup:
"Windows 10"
"LibreOffice 6.2.4.2"

Steps to Reproduce:
1.Open "Calc"
2.Press "Insert"->"Headers/Footers..."
3.Add any data to the "Header" tab
4.Add any data to the "Footer" tab
5.Press "OK"

Actual Results:
The data didn't show at the "Header/Footer" of the file. 

Expected Results:
The data added to "Header/Footer" should be shown in the header/footer of the file


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
-This happened with LibreOffice version 6.1.6 as well.
-When you enter to Header/Footers… again you will see that the data on the tab, but it will not show in the Header/Footer of the document.
-It happened when you chose Header/Footer to the file separately as well. 
-It happened when you enter both Custom footer/Custom header as well. Basically, all the function of Headers/Footers… not showed on the document. 
-If you open Microsoft Excel file, you won't see the Header/Footer on the screen, but the data of the Header/Footer will be showed in Insert->Headers/Footers…
-Saving the file did not make any changes 
-Headers/Footers on Writer do work. the menu looks different from Calc.

"Help"->About LibreOffice information:
Version: 6.2.4.2 (x64)
Build ID: 2412653d852ce75f65fbfa83fb7e7b669a126d64
CPU threads: 8; OS: Windows 10.0; UI render: GL; VCL: win; 
Locale: en-US (he_IL); UI-Language: en-GB
Calc: CL