octaeder

s. Pdf-Viewer menu Window/Show/Toolbar

In the windowed viewer you find: 

I struggled a bit with your example. Compilers pdflatex and lualatex worked fine when I used this: ```latex \documentclass{article} \usepackage{threeparttable} \begin{document} \begin{table*} \centering \caption{insert caption here, blah, blah, blah}\label{tab:IntObs} \begin{tabular}{ccccc}...

check this #2297

As a workaround one can open the temporary file (s. messages pane) in txs and compile it.

no issue with win10

TeXstudio 4.8.0 (git 4.8.0) Using Qt Version 6.7.0, compiled with Qt 6.7.0 R 

That's what I see:  Win10/MikTex TeXstudio 4.8.5 (git 4.8.5alpha1-29-gb7ef6508a) Using Qt Version 6.7.2, compiled with Qt 6.7.2 R

Do you follow the same procedure as I do? Start txs (best without any previous documents), open a new editor and paste the code from here, that you have posted...