The lines (Curves) are not visible! Help

This is weird, the lines are not visible unless it is selected only. The 3D model works fine, but the curves are not visible.

This is my system info:
Rhino 6 SR21 2019-12-15 (Public Build, 6.21.19349.01012, Git hash:master @ a9aff0b2a2e07411210fef500868737069a15926)
License type: Evaluation, build 2019-12-15
License details: Stand-Alone
Expires on: 2020-04-05

Apple Intel 64-bit macOS Version 10.14.6 (Build 18G1012) (Physical RAM: 8Gb)
Mac Model Identifier: MacBookAir7,2
Machine name: Spoorthi’s MacBook Air
Language: en-IN (MacOS default)

Intel® HD Graphics 6000 (OpenGL ver:4.1 INTEL-12.10.14)

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On

Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: Height

Vendor Name: Intel Inc.
Render version: 4.1
Shading Language: 4.10
Maximum Texture size: 16384 x 16384
Z-Buffer depth: n/a
Maximum Viewport size: 16384 x 16384
Total Video Memory: 1536 MB
Graphics: Intel HD Graphics 6000
Displays: Color LCD (126dpi 1x)

Graphics processors
Intel HD Graphics 6000 (1536 MB)
Color LCD (1440 x 900)

USB devices
Apple Inc.: Bluetooth USB Host Controller
Logitech: USB Optical Mouse

Bluetooth devices
Cambridge Silicon Radio: Hands-Free unit, SPP Dev, Headset

Third party kernel extensions

Third party plugins

Rhino plugins
/Applications/ “RhinoCycles” 6.21.19349.1012
/Applications/ “Snapshots” 6.21.19349.1002
/Applications/ “PanelingTools” 6.21.19349.1002
/Applications/ “Commands” 6.21.19349.1012
/Applications/ “RDK_EtoUI” 6.21.19349.1012
/Applications/ “Displacement” 6.21.19349.1002
/Applications/ “Rhino Render” 6.21.19349.1002
/Applications/ “Renderer Development Kit” 6.21.19349.1002

This is something that helped me and could be the same problem.

RHINOCEROS>Preferences>Display Modes

Select “WIREFRAME” (e.g.) and “OBJECTS”

Scroll Down to CURVES and set Curve Width to something greater than 1.

Do the same for other display modes.

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