Arrows will not render.
I tried:
Ensuring that images and object were enabled
Using hardware acceleration
Using Skia rendering
Version: 25.2.7.2 (X86_64) / LibreOffice Community
Build ID: 5cbfd1ab6520636bb5f7b99185aa69bd7456825d
CPU threads: 12; OS: Windows 10 X86_64 (10.0 build 19045); UI render: Skia/Raster; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL threaded
Which arrows? Your screenshot shows only some black rectangle selected over black background. What is inside? What is the save format?
Usually a screenshot has low informative value. It is better to attach a sample file.
If you click File > Print Preview do you see the arrows?
Arrows from menu Insert - Shape - Block Arrows includes a little gray circle to reshape it, and its area is blue. So it seems that its not this kind of arrows.
An .svg image with a black arrow would render black over black. So, no automatic white color (like text).
Post editing seems to be non-functional at this time (can not interact with text field) so I must post the sample file in a comment: https://drive.google.com/file/d/16n3uYNrMiE6HKhzdjwczxVMrjtbxFgZs/view?usp=sharing
Command in use is Arrow Shapes. There are no images involved.
There is a white rectangular object over the front of your page, try sending it to the back or deleting it
I see no Arrow Shapes (but Block Arrows) in menu Insert - Shapes.
There are two shapes in it. But both of them seem to be empty. Maybe a bug.
Can you test in Safe Mode?
There is not / this is not the cause because only the arrow tool was used.
Maybe.
The content.xml file is seemingly missing data.
<text:p text:style-name="Standard">
<draw:custom-shape text:anchor-type="paragraph" draw:z-index="0" draw:name="Shape 1" draw:style-name="gr1" svg:width="2.3543in" svg:height="1.5315in" svg:x="1.2335in" svg:y="0.411in">
<text:p/>
<draw:enhanced-geometry draw:type="non-primitive"/>
</draw:custom-shape>
<draw:custom-shape text:anchor-type="paragraph" draw:z-index="1" draw:name="Shape 2" draw:style-name="gr2" svg:width="0.6941in" svg:height="0.6941in" svg:x="3.4591in" svg:y="3.1055in">
<text:p/>
<draw:enhanced-geometry draw:type="non-primitive"/>
</draw:custom-shape>
</text:p>
+1
I already reinstalled, but I will do so again and manually scour for any remnant files.
Sample file made with safe mode: https://drive.google.com/file/d/1sm6fCYtp51TEGDObKbaYfs6hoVXDuMlm/view?usp=sharing
Clean reinstalling had no effect. Arrows made with Arrow Shapes command are still invisible regardless of color or line thickness.