When working with 3D modeling and rendering in Blender, it's important to have full control over the grid lines in the 3D view to ensure precision and accuracy in your projects. By default, only a limited number of grid lines are displayed in the 3D view, which might not be sufficient for your needs. Here's how you can make all grid lines show in 3D view in Blender.

1. Open Blender and navigate to the 3D view where you want to display all grid lines.

2. At the bottom of the 3D view, you will find a small grid icon. Click on the grid icon to open the Overlays menu.

3. In the Overlays menu, you will find the Grid option. Click on the Grid option to expand its settings.

4. Under the Grid settings, you will see options for Scale, Subdivisions, and Offset. By adjusting the Scale and Subdivisions, you can control the density and visibility of the grid lines in the 3D view.

5. To display all grid lines, increase the Subdivisions value to a higher number. This will add more grid lines to the 3D view, giving you better visualization and control over the environment.

6. You can also adjust the Scale value to control the spacing between the grid lines. Experiment with different Scale values to find the spacing that works best for your project.

7. Once you have adjusted the Scale and Subdivisions to your liking, you can also enable the Floor and X/Y/Z Axis options in the Overlays menu to further enhance the visibility of the grid lines and axes in the 3D view.

By following these steps, you can make all grid lines show in 3D view in Blender, allowing you to have better control and precision in your 3D modeling and rendering projects. Whether you are working on architectural visualization, product design, or any other 3D project, having all grid lines displayed in the 3D view can greatly improve your workflow and the quality of your final renders.