The problem with the line thickness of a border of a cell in Calc

The problem with the line thickness of a border of a cell in Calc. It seems the problem is old, but the solution could not be found. Description: in Calc, I can’t set the default line thickness to 0.5 or 0.75 PT instead of 0.05 PT (very thin!). Tried with styles (not saved) and with templates - if you set the border with borders, all cells get the borders of the specified value, and you need the default value to be applied only when I select a range and click the all borders button; if I create a template with the default thickness, but do not include borders for cells by default-again, when applied to the range, I get a thickness of 0.05 PT.
I want to be comfortable in excel: if a range can draw all the boundaries and that they were of normal thickness (ideally to have the opportunity to set it up) and to display a separate button in order to make it easier to draw a bold outer border without affecting the internal lines (in excel) via sidebar is not convenient, and the result is a too thick outer border.

I want to be comfortable in excel:…

I want to be comfortable when I read the questions from questioners.

Therefore I would like to ask you to read this here:

https://wiki.documentfoundation.org/Ask/Getting_Started

Maybe you can design your description so that you know exactly when you’re doing something in Calc and when you’re doing something in Excel.

Then tell me which operating system and which LibreOffice version you are working with.
And in what file format do you save? Thank you.

The problem with the display with different line widths mostly lies in the cooperation with the screen.

Try a higher zoom level.