How do I get glass walls without borders?

When I place glass walls, it shows the outline of every glass block. I see you-tubers like DanTDM or PopularMMOs have glass walls that look like one big glass block, with no block outlines. How do I get the glass without outlines?
Best Answer
I assume you mean something like this:
AFAIK, you can only do this with a mod called Optifine:
- Close Minecraft and the Launcher.
- Go to the download page and download Optifine HD Ultra for the MC version you are using.
- Open the
.jar
file you just downloaded (using java!) and click install.
When it is finished, close that and open Minecraft. There should be a profile called "Optifine". Select it and click play. All of your glass blocks will be changed to look like in the first screenshot.
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How do you make glass not have lines in Minecraft?
Cartographer villagers will buy glass panes for an emerald. Unlike fences, you can jump over them.Milgard® Moving Glass Wall Systems
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Answer 2
Aside from texture pack possibilities, there are two different types of glass in the stock game -- Glass, and Glass Pane. One looks like a window with an outline, the other looks more like a wall of glass.
You can create 16x Glass Pane using 6x Glass and a Crafting Table.
Answer 3
I made this texture pack which works without Optifine, you could try it https://www.curseforge.com/minecraft/texture-packs/clear-glass-without-optifine
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